Suppose that a "code" consists of 4 digits, none of which are repeated. (a digit is one of the 10 numbers 0,1,2,3,4,5,6,7,8,9) how many codes are possible?

Answers

Answer 1
The answer is 5040.

This is permutation without the repetition:
P = n!/(n - r)!

n - the number of choices
r - the number of chosen

We have:
n = 10
r = 4

P = 10!/(10 - 4)!
   = 10!/6!
   = (10 * 9 * 8 * 7 * 6 * 5 * 4 * 3 * 2 * 1) / (6 * 5 * 4 * 3 * 2 * 1)
   = 10 * 9 * 8 * 7
   = 5040

Related Questions

If 7 units represent 98 liters find the value of 15 units

Answers

First, you find out 1 unit, and you do this by dividing 98 by 7 which is 14 litres. Then, you multiply 14 by 15 which is 210 litres, which is your answer. Hope this helps!

Final answer:

To find the value of 15 units when 7 units represent 98 liters, set up a proportion, cross multiply, and divide to find the value of 15 units, which is 210 liters.

Explanation:

To find the value of 15 units when 7 units represent 98 liters:

Set up a proportion: 7 units = 98 liters and determine the value of 15 units.Cross multiply to solve for the unknown value: 7 units * x liters = 15 units * 98 liters.Divide to find the value of 15 units: x = (15 * 98) / 7 = 210 liters.

Before 1995, three-digit area codes for the united states had the following restrictions:
(a) neither 0 nor 1 could be used as the first digit.
(b) 0 or 1 had to be used for the second digit.
(c) there were no restrictions on the third digit.

How many different area codes were possible?

Answers

8C1*2C1*9C1
and the answer is 160

I will Upvote!
A bicyclist rides 14 miles in 112 minutes. If she continues at this speed, how long will it take her to travel 35 miles?
A) 43 minutes
B) 45 minutes
C) 280 minutes
D) 602 minutes

Answers

c) 280 minutes

You can use ratios:
14 miles   =   35 miles 
 112 min            x min

Then to solve for x you cross multiply to get 

14x = 3920 

Then isolate x to get 

x = 280

Therefore, it will take 280 minutes

If the altitude of an isosceles right triangle has a length of x units, what is the length of one leg of the large right triangle in terms of x? x units x units x units 2x units

Answers

the picture in the attached figure

we know that

if ABC is an isosceles triangle

then

AB=BC

angle A=angle C=45 degrees

and

triangle ABD and triangle BDC also are isosceles triangles

AD=BD=x

DC=BD=x

the hypotenuse AC is equal to

[tex] AC=AD+DC\\ AC=x+x\\ AC=2x [/tex]

To find the length AB applying the Pythagorean Theorem

[tex] AC^{2} =AB^{2} +BC^{2} [/tex]

remember that AB=BC

[tex] AC^{2} =2AB^{2} [/tex]

[tex] AC^{2} =2AB^{2}\\\\ AB=\frac{AC}{\sqrt{2}}\\\\ AB=\frac{2x}{\sqrt{2}}\\\\ AB=x\sqrt{2} [/tex]

therefore

the answer is

the length of one leg of the large right triangle in terms of x is equal to [tex] x\sqrt{2} [/tex]

Answer:

b)x/2

Step-by-step explanation:

took the test

In 5 years, Dad will be three times as old as his daughter Jill will be then. If the sum of their present ages is 50, how old are they now?

If x + 5 is Jill's age five years from now, which of the following equations could be used to solve the problem?
a.3x + 5 = 55 - x
b.3x + 15 = 55 - x
c.3x + 15 = 45 - x ...?

Answers

The answer is b.3x + 15 = 55 - x

x - Jill's present age
y - dad's present age

In 5 years, Dad will be three times as old as his daughter Jill will be then:
y + 5 = 3(x + 5)

The sum of their present ages is 50:
x + y = 50

We have the system of two equations now:
y + 5 = 3(x + 5)
x + y = 50

Let's rearrange the second equation:
If:         x + y = 50     
Then:  y = 50 - x

Now, substitute y from the second equation (y = 50 - x) into the first one:
y + 5 = 3(x + 5)
50 - x + 5 = 3(x + 5)
50 + 5 - x = 3*x + 3*5
55 - x = 3x + 15

Rearrange it a bit:
3x + 15 = 55 - x
Therefore, the correct choice is b.

Why is a larger down payment beneficial to a home investor?
a.
A larger down payment would only be beneficial to an investor if they intended on renting out the house.
b.
A larger down payment would enable an investor to get a loan with a higher interest rate and lower monthly payments.
c.
A larger down payment would enable an investor to get a loan with a lower interest rate and lower monthly payments.
d.
A larger down payment is essentially a larger bribe to the lending institution and gets the investor in their good favor.

Answers

I believe that would be C

The  larger down payment beneficial to a home investor is because of option C.

The following information should be considered:

The large down payment could enables the investor for getting out the loan that have the less interest payment and less monthly payment. So that it is easy for the investor to pay off.

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The price of a gallon of milk is 3.70 5 dollars what is the price that is rounded to the nearest dollar

Answers

pretty sure it would be 4.00

Alberto is making a budget. He owes a cell phone bill of $60 per month for 23 more months, plus the fees for any extra usage such as text messaging or extra minutes. Which of the following is the correct category for this expense?

a.
Essential (flexible) expense
b.
Emergency fund
c.
Essential (fixed) expense
d.
Non-essential expense

Answers

Answer:

a.  Essential (flexible) expense

Step-by-step explanation:

Most people consider a cell phone an essential expense, since they are used in power outages or emergencies while traveling.

This is a flexible expense, since there are extra fees for extra usage.  

The phone bill expense is an Essential (flexible) expense so option (A) will be correct.

What is the reasoning?

The procedure of utilizing logical reasoning to analyze a condition to determine the best problem-solving approach for a particular issue, then using this approach to create and explain a resolution.

In another word, reasoning is a tricky but interesting problem in mathematics that required relations of variables to solve.

The mobile cost is an essential cost because it is can be used in an emergency situation or it is very useful for calling massaging or video calling.

Since the plan for mobile recharge varies higher or lower according to benefits so it will be a flexible expense.

Hence "The phone bill expense is an Essential (flexible) expense".

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Jordan’s job is located 67 miles from his home. His car’s gas mileage is 21 miles to the gallon. Approximately how many gallons of gasoline does Jordan need each day?

Answers

I think the answer is 6.381 gallons or 3.2?

Answer:

The number of gallons of gasoline Jordan need each day is:

                            3.190476 gallons.

Step-by-step explanation:

It is given that:

Jordan’s job is located 67 miles from his home.

His car’s gas mileage is 21 miles to the gallon.

i.e. for 21 miles he need 1 gallon of gas.

This means in order to cover 1 mile he needs 1/21 gallon of gas.

Hence,

In order to cover 67 miles he needs 67/21 gallon of gas

i.e.

for 67 miles he needs 3.190476 gallons of gas.

Find the circumference of the circle if the square has an area of 144 m2. Give your answer to the nearest tenth. Use 3.14 form

Answers

Circumference of Circle = 2πr
Area of circle = πr²
144 = 3.14 * r²
r² = 144/3.14
r² = 45.85
r = √45.85
r = 6.77
 
Circumference = 2πr = 2*3.14*6.77
Circumference = 42.51 m²

So, your answer is 42.51 m²

The circumference of the circle is found by first determining the side length of the square, then using that to calculate the diameter and radius of the circle. Using 3.14 as an approximation for pi, the circumference is calculated to be 37.7 meters when rounded to the nearest tenth.

To find the circumference of the circle when the square has an area of 144 m², we first determine the side length of the square using the formula for the area of a square, A = a², where A is the area and a is the side length.

A = 144m²

a = 12m

Since the area is 144 m², the side length of the square is "12 m (since 12 x 12 = 144).

Since the circle fits perfectly within the square, the diameter D of the circle is equal to the side length of the square. Therefore, D = 12 m. The radius r is half the diameter, so in this case, r = 6 m.

The formula for the circumference C of a circle is C = 2πr.

C = 2 x 3.14 x 6 m = 37.68 m

The circumference is 37.7 m.

2n^2+3n-9 factoring trinomials

Answers

I hope this helps you



2n^3+3n-9


2n -3


n +3


(2n-3)(n+3)

The trinomial [tex]2n^2[/tex]+3n-9 cannot be factored using integers as no two numbers exist that multiply to give -18 (the product of the leading coefficient and the constant term) and add up to 3 (the middle coefficient).

To factor the quadratic trinomial [tex]2n^2[/tex]+3n-9, one must find two binomials that, when multiplied together, give the original trinomial. Factoring complex trinomials can sometimes be achieved by finding two numbers that multiply to give the product of the leading coefficient (2 in this case) and the constant term (-9 in this case), and add to give the middle coefficient (3 in this case). However, for this particular trinomial, such numbers do not exist, and it cannot be factored using integers. This means that either the trinomial is prime (cannot be factored), or it would require the quadratic formula to solve for factors involving irrational or complex numbers.

In 2000 Michigan had a population of 9,938,444. The number of people living in Michigan decreased by 0.6% in 2010. What was Michigan’s approximate population in 2010?

Answers

Multiply 9,938,444 by .6 to get your answer

Answer:

9,878,813

Step-by-step explanation:

First, make 0.6% into a decimal

0.6 / 100 = 0.006  

Then, multiply the number of people living in Michigan in 2000 by the number of people decreased (the percentage decrease) in 2010

9,938,444 x 0.006 = 59630.664

Last, subtract the percentage decrease by the original population in 2000

9,938,444 – 59630.664 = 9,878,813

In 2010 the approximate population in Michigan was about 9,878,813 (to the nearest whole person)


The height of a cone is two times its base diameter. What is the volume of the cone in terms of its base radius r?

Answers

Due to given condition we can conclude:
H = 2D
where D is diameter of base and H height of cone

Volume of cone is calculated by:

V = B*H = r^2*pi*H

Now we need to express H in terms of r. H = 2D = 2*2*r because D = 2r
V = r^2*pi*4r = 4r^3*pi

What is the coefficient of the term 43yz ? A. 1/3 B.4 C.4/3 D.4yz

Answers

The coefficient is just the number attached to the variables. 

So, it would be 43. 

I'm assuming you meant to write 4/3 yz? 

A convention center rents a meeting room for $250 per day. There is a $30 one-time fee to make a reservation.


What function equation represents the total cost to rent a meeting room for d days?

A. c(d) = 250d + 30

B. c(d) = 30d − 250

C. c(d) = 30d + 250

D. c(d) = 250d − 30

Answers

Thank you for posting your question here at brainly. I hope the answer will help you. Feel free to ask more questions.
Among the choices the function equation represents the total cost to rent a meeting room for d day is letter A which is c(d) = 250d + 30

For the function f(x) = x2 ­ -12, find (f o f­-1)(4)

Answers

remember that a function composed with its inverse results in the placeholder
aka
(f o f⁻¹)(x)=x

so
(f o f⁻¹)(4)=4

solve.

5m + 7/2 = -2m + 5/2

Answers

5m + 7/2 = -2m + 5/2
5m + 2m = 5/2 - 7/2
7m = -1
m = -1/7 <==

A 16-inch cheese pizza at Fine Dough Pizza costs $10.00 and each additional topping is $1.50. The same size pizza at Johnson's Pizza costs $8.00 and each additional topping is $2.00. After how many toppings do the pizzas cost the same? Which pizza costs more with additional toppings?

Answers

Final answer:

To find the number of toppings at which the pizzas cost the same, we can set the total cost expressions for both pizzas equal to each other and solve for 'x'. After 4 additional toppings, the pizzas will cost the same. With 5 additional toppings, Johnson's Pizza costs more.

Explanation:

To find the point at which the pizzas cost the same, we need to determine the number of toppings that will make the total cost equal for both pizzas. Let's denote the number of additional toppings as 'x', and the cost of each additional topping at Fine Dough Pizza as $1.50, and at Johnson's Pizza as $2.00. The total cost for Fine Dough Pizza will be $10.00 + $1.50x, and the total cost for Johnson's Pizza will be $8.00 + $2.00x. To find the number of toppings at which the pizzas cost the same, we can set the two total cost expressions equal to each other and solve for 'x':

$10.00 + $1.50x = $8.00 + $2.00x

To solve the equation, we can subtract $1.50x from both sides:

$10.00 = $8.00 + $0.50x

Next, we subtract $8.00 from both sides:

$2.00 = $0.50x

To isolate 'x', we divide both sides by $0.50:

x = 4

Therefore, after 4 additional toppings, the pizzas will cost the same.

To determine which pizza costs more with additional toppings, we can compare the total cost expressions for both pizzas for a specific number of toppings. For example, let's consider 5 additional toppings:

Total cost at Fine Dough Pizza = $10.00 + $1.50(5) = $10.00 + $7.50 = $17.50

Total cost at Johnson's Pizza = $8.00 + $2.00(5) = $8.00 + $10.00 = $18.00

Therefore, with 5 additional toppings, Johnson's Pizza costs more.

15 is what percent of 56

Answers

15 is 26.7857% of 56

8y + 9

What is the variable term in the expression?

Answers

Answer:

8y

Step-by-step explanation:I took the test

8y contain the variable term where the variable is 'y'.

What is Expression?

A mathematical operation such as subtraction, addition, multiplication, or division is used to combine terms into an expression. In a mathematical expression, the following terms are used:

An absolute numerical number is referred to as a constant.Variable: A symbol without a set value is referred to as a variable.Term: A term can be made up of a single constant, a single variable, or a mix of variables and constants multiplied or divided.Coefficient: In an expression, a coefficient is a number that is multiplied by a variable.

Given:

expression: 8y + 9

As, we know a symbol without a set value is referred to as a variable.

So, 8y contain the variable term where the variable is 'y'.

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Simplify as an Exponent: 10 •10• 3 • 3 • 3 =

Answers

I believe the answer would be 2700.
he is right its 2,700

write 33/72 in simplest form
11/72
33/24
33/72
11/24
please explain ...?

Answers

11/24
u basically divide the fraction by the greatest common factor. in this case, 4.
(33/72)/(4/4) = (11/24)
The best and most correct answer among the choices provided by your question is the third choice which is 33/72.

The fraction cannot be furthermore simplified because the numerator and denominator don't have a GCF.

I hope my answer has come to your help. Thank you for posting your question here in Brainly. We hope to answer more of your questions and inquiries soon. Have a nice day ahead!

a1,a2,a3....a30-each of these 30 sets has 5 elements.b1,b2,....bn-each of these n sets has 3 elements.union of a1,a2...a30=union of b1,b2....bn=S.
if each elements of S is in 10 a sets and 9 bsets.then n=?

Answers

 the number of elements in the union of the A sets is:5(30)−rAwhere r is the number of repeats.Likewise the number of elements in the B sets is:3n−rB
Each element in the union (in S) is repeated 10 times in A, which means if x was the real number of elements in A (not counting repeats) then 9 out of those 10 should be thrown away, or 9x.  Likewise on the B side, 8x of those elements should be thrown away. so now we have:150−9x=3n−8x⟺150−x=3n⟺50−x3=n
Now, to figure out what x is, we need to use the fact that the union of a group of sets contains every member of each set.  if every element in S is repeated 10 times, that means every element in the union of the A's is repeated 10 times.  This means that:150 /10=15is the number of elements in the the A's without repeats counted (same for the Bs as well).So now we have:50−15 /3=n⟺n=45

Plane ABC and plane BCE ____ be the same plane.

A. must

B. may

C. cannot

Answers

The answer is: [B]:  may.
______________________________________________
 
Plane ABC and Plane BCE  MAY be the same plane.
_____________________________________________
Note: We can still determine the answer WITHOUT an illustration.
______________________________________________
Explanation:
__________________________________Note that:  Two (2) points) determine a line; whereas three (3) points determine a plane. 
→ As such, Plane ABC and Plane BCE MAY be the same plane.  This would be the case if "Point E" is on Plane ABC.  {That is to say, if "Point A" is on Plane BCE }.

→This would be the only "circumstance".
___________________________________________
→ Hence the answer is: [B]:  may.
______________________________
Answer choice: [A]: "must" ; is incorrect.  
       It is clearly INCORRECT to say that:
"Plane ABC and Plane BCE "must" be the same plane._____________________________
Answer choice: [C]: "cannot" is clearly incorrect.
    As per the example explained above, it is clearly INCORRECT to say that:
   ""Plane ABC and Plane BCE "cannot" be the same plane.
__________________________________________________

Decide whether y is a function of x.
y=-3x-4

Answers

Yes, for every value of x, there is only one value of y. This means that y is a function of x.

Solve for b. ab + c = d b = a + c/d b = a/(c - d) b = (d - c)/a

Answers

b = (d - c)/a

ab + c = d >> ab + c - c = d - c
ab = d - c >> (ab)/a = (d - c)/a
b = (d - c)/a

Answer: im sorry if im wrong but i think the answer is 0.3

Step-by-step explanation:

If t = -2π/3, evaluate (if possible) sin t, cos t, tan t

Answers

t = - 2 π / 3 = - 120° = 240°
From the unit circle:
sin t = - √ 3 / 2
cos t = - 1/2
tan t = sin t / cos t = ( - √3 / 2 ) : ( - 1/2 ) = √ 3

P is the midpoint of QN, MP is perpendicular to to QN prove rectangle MRQ is congruent to rectangle MRN

Answers

Final answer:

By using the rules of geometry, we can determine that if P is the midpoint of QN and MP is perpendicular to QN, then rectangles MRQ and MRN are congruent. The congruency is due to the properties of rectangles, triangles, midpoints, and the Hypotenuse-Leg Theorem.

Explanation:

The proof of the congruence of rectangles MRQ and MRN involves geometry rules, particularly the properties of rectangles, triangles, and midpoints. Let's consider rectangle MRQ and MRN. We know that in a rectangle, diagonals are congruent. If P is the midpoint of QN, that means QP = PN. Additionally, if MP is perpendicular to QN, PMQR and PMNR are right triangles with the same hypotenuse.

Using the properties of triangles, we can say that if two right triangles have a congruent hypotenuse and one leg (which is MP in both cases), then these triangles are congruent. Therefore, ∆PMQR is congruent to ∆ PMNR by the Hypotenuse-Leg (HL) Theorem.

Considering that ∆ PMQR ≅ ∆ PMNR and QP = PN, we can say that quadrilaterals MRQN and MRNP are each a parallelogram. Additionally, since MP is perpendicular to QN, quadrilaterals MRQN and MRNP are actually rectangles based on the definition of a rectangle (a parallelogram with a right angle). Therefore, rectangle MRQ is congruent to rectangle MRN.

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From net earnings of $740 per month for the rent on an apartment she says the two friends what percent of income is her rent payment

Answers

$200 / $740 *100% = 27%

The diagram below shows a square inside a regular octagon. The apothem of the octagon is 13.28 units. To the nearest square unit, what is the area of the shaded region?

Answers

I hope this helps you

Area of shaded region is 463 square units.

What is area of octagon?

Area of octagon = [tex]\frac{1}{2}[/tex] × [tex]8[/tex] × base × height

What is apothem of octagon?

The apothem of any polygon is equal to the line that connects the center of the polygon with one of its sides perpendicularly. Using the apothem, we can calculate the area of the polygons in an easier way.

Given

Apothem of the octagon = 13.28 units

Base of octagon = 11 units

Area of octagon = [tex]\frac{1}{2}[/tex] × [tex]8[/tex] × base × height

= [tex]\frac{1}{2}[/tex] × [tex]11[/tex] × [tex]13.28[/tex] × [tex]8[/tex]

= 584.32

Area of square = side × side

= 11 × 11

= 121

Area of shaded region = Area of octagon - Area of square

= 84.32 - 121

= 463.32

≅ 463 square units.

Hence, area of shaded region is 463 square units.

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