The length of a rectangle is three inches more than the width. the area of the rectangle is 460 inches. if the width is x, what is the length in terms of x?

Answers

Answer 1
l=3+w (l=length, w=width)

l=3+x if x is the width


Answer 2

The length and width of the given rectangle are 23 and 20 inches respectively.

Suppose the width of the given rectangle=x inch

So, the length of the given rectangle = x+3 inch

What is the area of a rectangle?

The area of a rectangle with length l and width b is lb.

So, the area of the given rectangle = x(x+3)

Given that area of the rectangle = 460 squared inches

So, x(x+3)=460

[tex]x^{2} +3x=460[/tex]

[tex]x^{2} +x-460=0[/tex]

[tex]x^{2} +23x-20x-460=0[/tex]

[tex]x(x+23)-20(x+23) =0[/tex]

[tex](x+23) (x-20)=0[/tex]

[tex]x=-23[/tex]...Not possible

[tex]x=20[/tex]

The width of the rectangle =20 inches

So, the length of the rectangle =20+3 = 23 inches

Therefore, the length and width of the given rectangle are 23 and 20 inches respectively.

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Related Questions

Indicate a general rule for the nth term of this sequence. 12m, 15m, 18m, 21m, 24m,...

a. = 3mn + 9m
b. = -3mn - 9m
c. = -3mn + 9m
d. = 3mn - 9m

Answers

The given sequence is
12m, 15m, 18m, 21m, 24m, ...,

The 1st term is a₁ = 12m
The 2nd term is a₂ = 15m = a₁ + 3m = a₁ + (2-1)*3m
The 3rd term is  a₃ = 18m = a₂ + 3m = a₁ + (3-1)*3m

Because each successive term is 3m more than the previous term, we have an arithmetic sequence with a common difference of 3.

Answer:
The n-th term is
[tex]a_{n} = a_{1} + (n-1)*(3m),\\for\, n=1,2,3,\,...,[/tex]

In recursive form,
[tex]a_{n+1}=a_{n}+3m[/tex]


What is the number of degrees in the measure of each exterior angle of a regular polygon of 18 sides?

Answers

each angle would be 160 degrees. to get the answer to this you take the number of sides (n) and subtract 2 then multiply by 180 and divide by n

In which one of the above figures is AB = AC?

A. Figure B
B. Figure C
C. Figure A
D. Figure D

Answers

The answer is D. It is the only one that is for sure the answer.

Answer: The answer is (D). the image is attached.

Step-by-step explanation: We are given four figures from which we are to select the one with AB = AC.

In figure (A), AB and AC are two chords of the circle with common point A. Since the lengths of two chords of a circle may not be equal, so AB may not be equal to AC. This option is not correct.

In figure (B), AB is a tangent at point B and AC is the extension of a chord which meets the tangent AB at point A. Since the lengths of AB and AC may not be equal, so this option is also incorrect.

In figure (C), AB and AC are extensions of two chords which meets at point A outside the circle, so they may not be congruent. So, this option will also not work.

In figure (D), AB and AC are two tangents from a common point A to the circle at B and C respectively.

We have the Two-Tangent Theorem which states that if two tangent segments are drawn to one circle from the same external point, then they are congruent.

So, we have AB ≅ AC.

Thus, (D) is the correct option.

2[18-(5+9)÷7]
show how you did it

Answers

order of operations

PEMDAS
do parntheases
then exponents
then mutiply or divide, whichever coms first
then addd or subtract, whichever comes first

so

when doing parenthases, simplify innermost parenthsees first

so

2(18-(5+9)/7)
innermost is (5+9)=14

now we gots
2(18-(14)/7)
we can distribute or multiply the invisible -1 in front of the 14

2(18-14/7)
now divide because division comes before adition
remember that it is -14/7, not just 14/7 because the negative is part of the 14

2(18-2)

now simplify parenthasees
18-2=16
so

2(16)
multiply
32

the result is 32

What is the tangent ratio for angle f

Answers

tan(F) = 8/6 = 4/3

hope it helps
tan=opositeside/adjacentside
tan(f)=8/6=4/3

Use a translation rule to describe the translation of X that is 1 units to the left and 6 units up.

A.
T < -1, 6> (x)
B.
T < -1, -6> (x)
C.
T < 1, 6> (x)
D.
T < 1, -6> (x)

Answers

T < -1,6 >(x) <=======

Answer:

C. < 1,6 > (x)

Step-by-step explanation:

We know that,

Translation is the transformation that shifts the image in any direction.

The general form of horizontal translation of f(x) to f(x±k) and vertical translation of f(x) to f(x)±k where k is any constant.

Now, as the given function 'X' is translated 1 unit to the left i.e. translated horizontally by 1 unit i.e. X+1.

Also, the function is translated 6 units up i.e. translated vertically by 6 units i.e. X+6.

Hence, the solution is < 1,6 >(x).

Someone pls help me!! and thank you if you do !

Answers

It is A, the contrapositive is always true is the statement use true

A game spinner is divided into 5 equal sections numbered 1 to 5. How many outcomes are in the sample space for 4 spins of this spinner? a. 625 b. 125 c. 20 d. 500

Answers

spin 1 ~ 5
spin 2 ~ 5
spin 3 ~ 5
spin 4 ~ 5
5 * 5* 5 * 5 = 5^ 4 = 625
Letter A

The correct option is a. 625.

The total number of outcomes in 4 spins of the spinner can be found by multiplying the number of outcomes in one spin by itself 4 times, resulting in 625 outcomes.

The sample space for 4 spins of the spinner can be calculated by raising the number of outcomes in one spin to the power of the number of spins.

In this case, as there are 5 outcomes on the spinner, the total number of outcomes in 4 spins would be 5^4 = 625.

Therefore, the correct option is a. 625.

The estimated measurements of the objects are shown below.

-length of a grain of salt: 0.0002 centimeters
-width of a key ring: 0.02 centimeters

Find the measurements written in standard notation to the estimated measurements in scientific notation.

Answers

Final answer:

The standard notation 0.0002 cm becomes 2 × 10^-4 and 0.02 cm becomes 2 × 10^-2, both in scientific notation.

Explanation:

The standard notation for 0.0002 centimeters is 2 × 10^-4 in scientific notation. Meanwhile, the standard notation for 0.02 centimeters is 2 × 10^-2 in scientific notation.

You arrive at these translations by recognizing that the number 0.0002 means you've moved the decimal point four units to the right from 2 (thus raising 10, the base, to -4), and 0.02 represents moving the decimal point two units to the right from 2 (thus raising 10 to the -2).

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In which section of the number line is √32?

Answers

sqrt(32) = 5.66

 so it is in section B

Answer:

section B.

YOUR WELCOME



Which of the following is a solution to the inequality y < –2x + 3?

A. (1,1)
B. (3,0)
C. (-3,10)
D. (0,0)


Please select the best answer from the choices provided

Answers

y < -2x +3

A. (1, 1) → x = 1, y = 1

substitute:

1 < -2(1) + 3

1 < 1 FALSE

B. (3, 0) → x = 3, y = 0

substitute

0 < -2(3) +3

0 < -3 FALSE

C. (-3, 10) → x = -3, y = 10

substitute

10 < -2(-3) +3

10 < 9 FALSE

D. (0, 0) → x = 0, y = 0

substitute

0 < -2(0) + 3

0 < 3 CORRECT

Answer: D. (0, 0)

The tile pattern shown was used in Pompeii for paving. If the diagonals of each rhombus are 2 inches & 3 inches, what area makes up each cube in the pattern?

Answers

The tile in Pompeii shows that there are 3 shapes of rhombus in one cube.
A ( rhombus ) = d1 * d2 / 2
d1 = 2 in,  d2 = 3 in.
A ( rhombus ) = 2 * 3 / 2 = 3 in²
Finally:  3 * 3 = 9 in²
Answer: Area of each cube in the pattern is 9 in².

If the area of a rectangle is 16 then the length is 4 and the width is 4 what is the counterexample

Answers

The width and length could also be 8 and 2

If 4 less than a number is less than 4 and greater than -3, find the number.

Answers

-3 < number - 4 < 4 ---> 1 < number < 8,

many (if integers: 2, 3, 4, 5, 6, and 7) Are you sure it is greater than -3?

The scatter plot shows the test scores of a group of students who surfed the Internet for different amounts of time in a day.

What will most likely happen to the test scores of students if the number of hours they surf the Internet increases?

Test scores will decrease because the graph shows a negative association.
Test scores will increase because the graph shows a positive association.
Test scores will increase because the graph shows a negative association.
Test scores will decrease because the graph shows a positive association.

Answers

Answer: The correct answer is "Test scores will increase because the graph shows a negative association."

Step-by-step explanation: Negative association is decreasing and positive is increasing but in this case we flip it to get our answer.

Final answer:

The impact of time spent surfing the internet on students' test scores depends on whether the association represented on the scatter plot is positive or negative. In a positive association, scores increase with increased internet time, while in a negative association, scores decrease.

Explanation:

Based on the question, it seems there is a relationship between the time spent surfing the Internet and students' test scores which is represented by a scatter plot. The association between these variables can be either positive, negative, or no association. A positive association means as the hours of surfing the internet increase, the test scores also increase. A negative association implies that as the hours of surfing the internet increase, the test scores decrease.

However, the question didn't provide the information about whether the scatter plot shows a positive or a negative association between these two variables, which is crucial to determine what happens to the test scores as internet surfing time increases.

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How were the numbers 1 10 100 and 1000 written by romans?

Answers

1 --  I
10 -- X
100 -- C
1000 -- M 

What is 35 minus 3 times 8

Answers

35-3*8

Evaluate multiplication first (order of operations).
35-24

Then subtract
35-24=11

Final answer: 11
Use PEMDAS.
First you would multiply 8•3 which gives you 24.
Then you would subtract 24 from 35
35 - 24 = 11
Final answer: 11
:)

A file that is 256 megabytes is being downloaded. If the download is 18.6% complete, how many megabytes have been downloaded? Round your answer to the nearest tenth.

Answers

If A file that is 256 megabytes is being downloaded and the download is 18.6% complete, then you just need to multiply the 256 megabytes with 18.6%

The calculation would be: 256 megabytes x 0,186= 47.616 megabytes. 
If you round up the answer to nearest tenth it will be 47.6 megabytes

Based on the chart, which would be considered the dependant variable?

Answers

a dependent value is what you measure in the experiment 

Answer:

u didn't provide a chart but the dependent variable is the y axis, or the vertical line

Step-by-step explanation:

It's always the y axis (the vertical line)

Q and R are independent events. If P(Q)= 1/8 and P(R)=2/5 find P(Q and R).

Answers

Answer: 1/20
To find P(Q and R), you have to multiply P(Q) by P(R) to get the probability that both events will occur. P(Q) = 1/8, and P(R) = 2/5, so when multiplied together, you get 2/40. This simplifies to 1/20, meaning P(Q and R) = 1/20.
Final answer:

The probability of independent events Q and R both occurring is calculated by multiplying the individual probabilities of each event. Thus in this case, P(Q and R) = (1/8) * (2/5) = 1/20.

Explanation:

The question posed asks for the probability of events Q and R both occurring. Given that Q and R are independent events, the likelihood of both happening is calculated by multiplying the probabilities of each event.

That is, P(Q and R) = P(Q)P(R). From the question, we know that P(Q) is 1/8 and P(R) is 2/5.

Therefore, the probability of both Q and R occurring would be (1/8) * (2/5) = 1/20.

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How do you simplify the square root of 27?

Answers

Start by finding the numbers that go into 27.  1, 27...3, 9...I think that's it, right? One of those numbers is a perfect square.  The 9.  Rewrite the radical like this then:
[tex] \sqrt{27} = \sqrt{9*3} [/tex]
Now break up the 9 into its perfect square:
[tex] \sqrt{(3*3)*3} [/tex]
Because there are 3 3's you can pull out the root of 9, which is one of those 3's.  It will then simplify to
[tex]3 \sqrt{3} [/tex]
If you had the square root of 8, that would simplify to
[tex] \sqrt{8} = \sqrt{4*2} [/tex]
4 is a prfect square (2 times 2), so you can pull out a 2, leaving the other 2 under the radical
[tex] \sqrt{4*2} = \sqrt{(2*2)*2} =2 \sqrt{2} [/tex]
Hope that makes sense. If you'd like some more examples to help clarify, just ask!

Name the binomial you can multiply by (x + 9) to get the product x 2 + 5x – 36. A. 4 – x B. x + 6 C. x – 4 D. x – 6

Answers

First factor the quadratic equation then find the other factor.

To factor the quadratic equation, find two numbers that add to 5 and multiply to -36.

I got 9 and -4.

So, the factors are (x + 9) and (x - 4).

So, C x - 4 is the answer.

A city's current population is 1,000,000 people. It is growing at a rate of 3.5% per year. The equation P=1,000,000(1.035)^x models the city's population growth where x is the number of years from the current year. In approximately how many years will the pooulation be 1,400,000? Round to nearest tenth

Answers

To determine the number of years to reach a certain number of population, we need an equation which would relate population and the number of years. For this problem, we use the given equation:

P=1,000,000(1.035)^x

We substitute the population desired to be reached to the equation and evaluate the value of x.

P=1,000,000(1.035)^x
1400000=1,000,000(1.035)^x
7/5 = 1.035^x
ln 7/5 = ln 1.035^x
x = ln 7/5 / ln 1.035
x = 9.78

Therefore, the number of years needed to reach a population of 1400000 with a starting population of 1000000 would be approximately 10 years.

Grace is half her father joseph's age. in 10 years grace will be three-fifths joseph's age. ten years ago, grace was one third joseph's age. how old are grace and joseph now

Answers

grace is 20 and joseph is 40

After setting up a system of equations based on the given age relationships and solving for both Grace and Joseph, we deduce that Grace is 20 years old and Joseph is 40 years old currently.

Let's denote Grace's current age as G and Joseph's current age as J. According to the problem, Grace is half of Joseph's age, so we have the first equation:

G = 0.5 * J

In 10 years, Grace will be three-fifths of Joseph's age, giving us the second equation:

G + 10 = (3/5) * (J + 10)

Ten years ago, Grace was one-third of Joseph's age, which gives us the third equation:

G - 10 = (1/3) * (J - 10)

We now have a system of three equations with two variables. We can solve this system to find the current ages of Grace and Joseph. After solving for G and J, we find that Grace is 20 years old and Joseph is 40 years old.

Using the Degree minute second method to describe an angle, one degree of angle measurement can be divided into how many minutes?

Answers

one degree can be divided into 60 minutes.

Help thank you :((((((((((((((((((

Answers

The slope of the horizontal line is 0, so the y is a constant at 2.
The line is not dashed, so it is more than or equal to since the shading is above the line.

The slope of the line going up is 1 (rise over run). The line is dashed and it is shaded below the line so the sign must be <.

Final answer: D

LAW ENFORCEMENT: A police accident investigator can use the formula S=25L‾‾‾√S=25L to estimate the speed s of a car in miles per hour based on the length l in feet of the skid marks it left. How fast was a car traveling that left skid marks 109 feet long?

Answers

Given that the speed of a car in mph can be estimated using the formula 
sqrtS=25L
where:
L is the length in feet of skid marks it left.
Thus the speed of a car with skid marks L=107 ft =107/5280=0.02 miles, will be:
sqrtS=25*0.02=0.5
thus the speed will be given by:
S=(0.5)^2=0.25 miles per hour

In ΔABC shown below, point A is at (0, 0), point B is at (x2, 0), point C is at (x1, y1), point D is at x sub 1 over 2, y sub 1 over 2, and point E is at the quantity of x sub 1 plus x sub 2 over 2, y sub 1 over 2: Triangle ABC is shown. Point D lies on segment AC and point E lies on segment BC. A segment is drawn between points D and E. Point A is at the origin. Prove that segment DE is parallel to segment AB.

Answers

Segment AB has slope 0. Segment DE, with midpoints of AC and BC, also has slope 0. Thus, DE is parallel to AB.

To prove that segment DE is parallel to segment AB, we need to show that the slopes of both segments are equal.

The slope of segment AB, denoted as [tex]\( m_{AB} \)[/tex], can be calculated using the coordinates of points A and B:

[tex]\[ m_{AB} = \frac{{y_B - y_A}}{{x_B - x_A}} \][/tex]

Given that point A is at (0, 0) and point B is at [tex]\((x_2, 0)\)[/tex], the slope [tex]\( m_{AB} \)[/tex] is:

[tex]\[ m_{AB} = \frac{{0 - 0}}{{x_2 - 0}} = 0 \][/tex]

Now, let's find the coordinates of points D and E.

Point D lies on segment AC, so it is at the midpoint of segment AC. Therefore, the coordinates of point D, denoted as [tex]\((x_{D}, y_{D})\)[/tex], are the average of the coordinates of points A and C:

[tex]\[ x_{D} = \frac{{x_1 + 0}}{2} = \frac{{x_1}}{2} \][/tex]

[tex]\[ y_{D} = \frac{{y_1 + 0}}{2} = \frac{{y_1}}{2} \][/tex]

Similarly, point E lies on segment BC, so it is at the midpoint of segment BC. Therefore, the coordinates of point E, denoted as [tex]\((x_{E}, y_{E})\)[/tex], are the average of the coordinates of points B and C:

[tex]\[ x_{E} = \frac{{x_1 + x_2}}{2} \][/tex]

[tex]\[ y_{E} = \frac{{y_1 + 0}}{2} = \frac{{y_1}}{2} \][/tex]

Now, let's calculate the slope of segment DE, denoted as [tex]\( m_{DE} \)[/tex]:

[tex]\[ m_{DE} = \frac{{y_{E} - y_{D}}}{{x_{E} - x_{D}}} \][/tex]

Substituting the coordinates of points D and E:

[tex]\[ m_{DE} = \frac{{\frac{{y_1}}{2} - \frac{{y_1}}{2}}}{{\frac{{x_1 + x_2}}{2} - \frac{{x_1}}{2}}} \][/tex]

[tex]\[ m_{DE} = \frac{0}{{\frac{{x_1 + x_2 - x_1}}{2}}} \][/tex]

[tex]\[ m_{DE} = 0 \][/tex]

Since the slopes of segments AB and DE are both equal to 0, we can conclude that segment DE is parallel to segment AB.

I just need the answers for this.im really confused

Answers

Question a)

We have weekly saving of $2.50, the target amount of $85.98 and the amount carried forward from birthday present of $35, We want to work out the number of weeks we need to save to buy season pass

By working backwards, the steps are
[tex]85.98-35=50.98[/tex] ⇒ We subtract the birthday money from the season-pass fee
[tex]50.98/2.50 = 20.392[/tex] ≈ 21 Weeks ⇒ We divide by the amount we save every week

The answer is rounded up to 21 weeks

Question b)

Let the number of weeks be '[tex]x[/tex]' and the season-pass fee be '[tex]y[/tex]'

The equation that represents the context is
[tex]y=35+25x[/tex] 

In words: To achieve the value [tex]y[/tex] we need to multiply [tex]x[/tex] by $2.50 (saving) and add $35 (birthday money) 

We know that [tex]y=85.98[/tex] as this is the amount we aim to achieve by saving $2.50 per week. Substituting this into the equation we formed earlier we have

[tex]85.98=35+2.5x[/tex] ⇒ Subtract 35 from both sides
[tex]85.98-35=35-35+2.5x[/tex]
[tex]50.98=2.5x[/tex] ⇒ Divide both sides by 2.5
[tex] \frac{50.98}{2.5}= \frac{2.5x}{2.5} [/tex]
[tex]x=20.392[/tex] ≈ 21

We round the answer to 21 weeks. We achieve the same answer with part a)

Question c)

This time, we aim to save $85.98 by the end of 11th week. We might need to adjust the amount we save per week. We will use the same equation we form in part b) but this time we will use the variable [tex]'s'[/tex] to represent the amount of weekly saving.

[tex]y=35+11s[/tex] ⇒ where [tex]y[/tex] is the season pass fee, '35' is the birthday money, '11' is the number of weeks, and [tex]'s'[/tex] is the amount of saving

We have [tex]y=85.98[/tex]

[tex]85.98=35+11s[/tex]
[tex]85.98-35=11s[/tex]
[tex]50.98=11s[/tex]
[tex]s= \frac{50.98}{11}=4.6345 [/tex] ≈ 5

The answer is $5 to be saved for 11 weeks to achieve $85.98
----------------------------------------------------------------------------------------------------------------

Use the same equation to work out the number of weeks we need to save $2.50 per week if we have to pay the higher price of season pass fee of $120.98

[tex]y=35+2.50x[/tex]
[tex]120.98=35+2.5x[/tex]
[tex]120.98-35=2.5x[/tex]
[tex]85.98=2.5x[/tex]
[tex]x= \frac{85.98}{2.5}=34.392 [/tex]≈ 35 weeks

-----------------------------------------------------------------------------------------------------------

If we can start saving as early as possible, then 21 weeks of $2.50/week would work for the cheaper price of season-fee and we don't need to adjust the budget. However, if we still want to aim for $85.98 season pass fee, but only have fewer weeks to save, then adjusting budget is necessary. We can perhaps decide not to go bowling every week so we can use the budget for saving instead, or we can alternate between bowling and movie every week. 

Question d)

Using the original budget, we work out a third of $2.50 which is 2.5÷3 = 0.83
It means we have 2.5-0.83 = 1.6 left to save weekly. 

Using the same equation with part b)
[tex]y=35+1.6x[/tex] ⇒ Notice that we adjust the constant 2.5 to 1.6
[tex]85.98 = 35+1.6x[/tex] ⇒ We still aim to save for the cheapest season-pass
[tex]85.98-35=1.6x[/tex]
[tex]50.98=1.6x[/tex]
[tex]x= \frac{50.98}{1.6}=31.8625 [/tex] ≈ 32 weeks

We will have 32 weeks × $0.83 = $26.56 to buy gift for Mother.

Question e)

From information from part a) to part d), there are many different ways to adjust the budget. 




HELP PLEASE ASAP !!!! 80 POINTS !!!!!!!

There are 975 birds in an aviary. Each month, the number of birds decreases by 7%. There are 350 trees in the aviary. Each month, 7 trees are removed.

Part A: Write functions to represent the number of birds and the number of trees in the aviary throughout the months. (4 points)

Part B: How many birds are in the aviary after 12 months? How many trees are in the aviary after the same number of months? (2 points)

Part C: After approximately how many months is the number of birds and the number of trees the same? Justify your answer mathematically. (4 points)

Answers

Part A

months = m

 since birds decrease by 7%, there will be 93% left. 93% = 0.93
birds: 975 x 0.93^m
trees: 350 - 7m


Part B
birds: 975 x 0.93^12 = 408
trees: 350-7(12) = 266


Part C

350 - 7m = 0.93^m(975)

We have intersection points at approximately 22.21 and 44.4781. round off to whole numbers, we have 22 and 44 months.

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An artisan is creating a circular street mural for an art festival. The mural is going to be 50 feet wide. One sector of the mural spans 38 degrees. What is the area of the sector to the nearest square foot? Women were guaranteed the right to vote by __________. korematsu v. united states reed v. reed the nineteenth amendment the 1964 civil rights act the 1965 voting rights act Juan will rent a car for the weekend. He can choose one of two plans. The first plan has an initial fee of $55 and costs an additional $0.30 per mile driven. The second plan has no initial fee but costs $0.80 per mile driven. For what amount of driving do the two plans cost the same?What is the cost when the two plans cost the same? If BC=5.3, CD=8.8, and AD= 14.3, find AB to the nearest tenth. A and b are complementary angles find a and b a=3/4x-13 b=3x-17 1. Evaluate 6.314 - 9.77.3.456-3.464-3.456-16.0842. Evaluate -5.118 - (-4.1).-9.218-1.0181.0189.2183. Find the value of x + y for x = 75.9 and y = 2.65.10.24102.478.5579.554. Find the value of -x + y for x = 75.9 and y = 2.65.-78.5578.5573.25-73.25 What is the probability that a randomly selected person will have a birthday in march? assume that this person was not born in a leap year. express your answer as a simplified fraction or a decimal rounded to four decimal places? 5/14 divided by 3/4, what's the answer Solve 2a 2 - 3a - 2 = 0{-1/2, 2}{1/2, -2}{} Find the area of the triangle What 1 medical field would use information regarding integumentary, skeletal/muscular, and digestive system knowledge? HELP NOW PLEASE!1. STORIES OF USEFUL INVENTIONS, excerptBy S. E. Forman1911THE MATCHThere never was a time when the world was without fire, but there was a time when men did not know how to kindle fire; and after they learned how to kindle one, it was a long, long time before they learned how to kindle one easily. In these days we can kindle a fire without any trouble, because we can easily get a match; but we must remember that the match is one of the most wonderful things in the world, and that it took men thousands of years to learn how to make one. Let us learn the history of this familiar little object, the match.Fire was first given to man by nature itself. When a forest is set on fire by cinders from a neighboring volcano, or when a tree is set ablaze by a thunderbolt, we may say that nature strikes a match. In the early history of the world, nature had to kindle all the fires, for man by his own effort was unable to produce a spark. The first method, then, of getting fire for use was to light sticks of wood at a flame kindled by natureby a volcano, perhaps, or by a stroke of lightning. These firebrands were carried to the home and used in kindling the fires there. The fire secured in this way was carefully guarded and was kept burning as long as possible. But the flame, however faithfully watched, would sometimes be extinguished. A sudden gust of wind or a sudden shower would put it out. Then a new firebrand would have to be secured, and this often meant a long journey and a deal of trouble.In 1827, John Walker, a druggist in a small English town, tipped a splint with sulphur, chlorate of potash, and sulphid of antimony, and rubbed it on sandpaper, and it burst into flame. The druggist had discovered the first friction-chemical match, the kind we use to-day. It is called friction-chemical because it is made by mixing certain chemicals together and rubbing them. Although Walker's match did not require the bottle of acid, nevertheless it was not a good one. It could be lighted only by hard rubbing, and it sputtered and threw fire in all directions. In a few years, however, phosphorus was substituted on the tip for antimony, and the change worked wonders. The match could now be lighted with very little rubbing, and it was no longer necessary to have sandpaper upon which to rub it. It would ignite when rubbed on any dry surface, and there was no longer any sputtering. This was the phosphorus match, the match with which we are so familiar.What is the main idea of the last paragraph? Early matches were dangerous and awkward. John Walker made the first match. Phosphorus was the key to the modern match. Walker's match was better than what came before.2. What is the main idea of the first paragraph? (SAME STORY AS ABOVE) It took humans a long time to develop the match. Learning how to make fire was a long struggle for humans. The world went for years without adequate fire. We often forget how the match changed the world. 517.21 km what is the nearest 10km? Find the product.(n + 7)(n - 2)n - 5n - 14n + 5n - 14n - 5n + 14 Steam Workshop Downloader