Mathematics Middle School

Choose the correct formula for combination.
A . n!/r!(n-r)!
B. n!/(n-r)!

Answers

Answer 1

Answer:

A. [tex]\frac{n!}{(n-r!)r!}[/tex]

Step-by-step explanation:

The formula for combinations is: [tex]\frac{n!}{(n-r!)r!}[/tex].

The formula for permutations is: [tex]\frac{n!}{(n-r!)}[/tex]

So, the correct answer is A.

Answer 2
The answer is A. n!/r(n-r)!

Related Questions

Factor the expression using the GCF.

Answers

[tex]\mathbb{ANSWER:}\downarrow[/tex]

[tex]\mathrm{4(2x+5y)}[/tex]

[tex]\textsc{Explanation\::}[/tex]

Use the GCF to factor this expression .

The GCF stands for :

[tex]\pmb{G}[/tex] stands for Greatest

[tex]\pmb{C}[/tex] stands for Common

[tex]\pmb{F}[/tex] stands for Factor

[tex]\pmb{GCF}[/tex] = Greatest Common Factor

The abbreviation GCF comes in handy when it comes to factoring expressions like 8x+20y ( :

The Greatest Common Factor of 8x+20y is 4 , so that's what we factor out :

4(2x+5y)

Hint : Enter 4 , then 2 , then 5)

[tex]\footnotesize\textit{hope helpful ( :}[/tex]

Answer:

4 , 2 , 5

Step-by-step explanation:

break down 8 an 20 to its simplest multiple factors 8 is 4 an 2 and 20 is 4 an 5 just plug them into box

Juanita bought a square calculator that has a measurement of 8.2 sq cm on one side. What is the area of the calculator?

A. 32.8 cm
B. 34.8 cm
C. 67.24 cm
D. 672.4 cm

Answers

Since all sides of a square are the same you can square the side length you are given.
A = (8.2)x(8.2) or 8.2^2
That would give you 67.24

Hazel's backyard deck cost $76.13 per square yard to build. The deck is 7 yards wide and 11 yards long. How much did it cost to build the deck?

Answers

If I’m not mistaken it should be $5,862.1

all y'all need is 100 points and brainliest when it offers me

Answers

Answer:

ok i think 25

Step-by-step explanation:

I also need help on this one too its so confusing!

Answers

Answer:

see below

Step-by-step explanation:

3 orders of fries, so 3x4.25

you have to multiply this by the percentage, 5%, which is converted to .05

so .05 times 12.75 equals $63.75

Thats your answer

3 x 4.25 then once you got that answer %5 is .05 times that by the answer you get for 3 x 4.25

The table shows the change in the water level (in centimeters) of a reservoir for three months. Find the total change in the water level for the three-month period. Write your answer as a fraction or mixed number in simplest form.

Answers

Answer:

[tex]-\frac{65}{28}[/tex] or [tex]-2\frac{9}{28}[/tex]

Step-by-step explanation:

Add all fractions:

[tex]-1\frac{3}{4}[/tex] + [tex]-\frac{1}{28}[/tex] + [tex]-\frac{15}{28}[/tex] = [tex]-\frac{65}{28}[/tex]

Simplify if needed:

[tex]-\frac{65}{28}[/tex] = [tex]-2\frac{9}{28}[/tex]

Can someone help me please

Answers

Answer:

25/4

Step-by-step explanation:

equation:2 1/2*2 1/2

2 1/2=5/2

5/2*5/2=5*5/2*2=25/4

Please help me for 70 points!

Answers

Answer:

49

Step-by-step explanation:

-11 2/3 * (-4 1/5) =

-35/3 * (-4 1/5) =

-35/3 * (-21/5) =

7 * 7 =

49

The answer is 49

How? It’s because -11 2/3 x (-4 1/5) =
-35/3 x (-4 1/5)
-35/3 x (-21/5)=
7x7 = 49

Select the procedure that can be used to show the converse of the Pythagorean theorem using side lengths chosen from 6 cm, 8 cm, 10 cm, and 12 cm

Answers

Answer:

I think A

Step-by-step explanation:

With the equasions shown A makes the most sense

A satellite flies 178794178794 miles in 20.7920.79 hours. How long would it take to fly \text{192296}192296 miles?

Answers

Answer:

3100C

Step-by-step explanation:

Mrs. Blair believes there is a relationship between the number of minutes students study and their test grades. She asked her history class to list the number of minutes they studied and their test grade. Using the information provided draw a scatterplot.What test grade might a student expect if they studied approximately 95 minutes?X + YA)60B)80C)100D)120

Answers

Answer:

I would say C 80. I'm not fully sure tho.

Step-by-step explanation:

Sorry If I'm late on this or If I'm wrong

PLEASE HELP ME I WILL GIVE BRAINLYEST

Answers

It looks like you have to find N and then multiply each angle measure given to finds the correct angle measures. Remember, if you add up all of the interior angles in a triangle, it adds up to 180 degrees. So 3.2n + 6.4n + 2.4n = 180 degrees. You must solve for N. Combine all of them. The sum is 12n = 180 degrees. I'll let you solve for N. When you do, multiply each number in the triangle by N to find each angle measure. The formulas above are for the area of different geometric shapes, but won't help with this question.

I need Help now Please!!!!!!!!!

Answers

The equation of the scenario is y = 3/2x + 4 and the scenario is not a proportional function

How to determine the equation of the scenario?

From the scenario, we have:

Base distance = 4

Rate = 3 miles every 2 hours

So, the function is:

y = 3/2x + 4

Where x represents the time and y represents the distance travelled

How to complete the table?

When x = 0, we have:

y = 3/2(0) + 4 = 4

Using other values of x, we have:

y = 3/2(1) + 4 = 5.5

y = 3/2(2) + 4 = 7

y = 3/2(3) + 4 = 8.5

y = 3/2(4) + 4 = 9

So, the complete table is:

x        Process     y

0       3/2(0) + 4   4

1        3/2(1) + 4    5.5

2       3/2(2) + 4    7

3       3/2(3) + 4    8.5

4       3/2(4) + 4    9

Is the scenario a proportional function?

No, it is not a proportional function, because when x = 0, the value of y is not 0

Read more about linear functions at:

https://brainly.com/question/4025726

#SPJ1

It isNot proportionate

you have $20:00 to spend on an Easter gift. you buy 1 dozen tulips for $15.35. with the money you have left, how many chocolate bunnies could you buy? each bunny cost $1.25.

Answers

All you’re doing is subtracting $15.35 from $20.00. After you get the answer, add $1.25 as many times as possible before it exceeds the number you got from the first subtraction.

$20.00 - 15.35 = $4.65
$1.25 x 3 = $3.75
(Anything over $3.75 would require additional money, so you couldn’t buy any more chocolate bunnies than 3.)

You could buy 3 chocolate bunnies after purchasing 1 dozen tulips for $15.35 with the remaining $4.65 you have left.

I struggle with math myself, so I’d recommend working it out on your own instead of pasting online answers because it pays off in the end! <3

pleaaase help

Which word problem matches the expression? 3/4 × 7

A) Brooke runs 3 4 of a mile everyday. How many miles does she run in a week?
B) Brooke runs 7 miles on Monday and 3 4 of a mile the next day. How many miles does she run?
C) Brooke tries to run 7 miles, but she stops with 3 4 of a mile to go. How many miles does she run?
D) Brooke wants to run 7 miles, but only has time to run 3 4 of a mile. How many miles does she run?

Answers

Hello can I have brainliest if I’m right. The answer is a. I got it by looking at the 3/4. I saw n the first one that it had 3/4 times seven which is 3/4 a week.
I’m sorry as I’m not entirely sure if my answer is correct, but I would believe the answer is C

Olga buys 54 stickers. The stickers are arranged on 6 sheets, with the same number of stickers on each sheet. Which equation and answer show how many stickers are on each sheet?

Answers

54 divided by 6 = 9 stickers on each sheet
54 divided by 6 = 9

Olga has 9 stickers on each sheet.
Your equation would be 54 divided by 6 = 9 (I don’t have a division sign)

A prism has a length of 3 and one-half centimeters, width of 6 centimeters, and height of 7 and one-half centimeters.
Find the volume of the rectangular prism using the formula V = Bh.

The area of the base, B, equals
cm2.
The volume of the prism is
cm3.

Answers

Answer:

The area of the base, B, equals  

✔ 21

cm2.

The volume of the prism is  

✔ 157 1/2

cm3.

Step-by-step explanation:

I took the test one time

Drag a vertex of the triangle to change its shape.
Double-click or double-tap a vertex or side to prevent it from
changing.
Problem: Construct a triangle with interior angle
measures of 60° and 60°. Let one of the side lengths be
10. What are the lengths of the other sides?
2C = 41
9.2
0
5 and 6
6 and 7
8 and 8
10 and 10
ZA= 49°
6.0
ZB = 90°

Answers

Where it says <B or <A are angle measures. Set the bottom 2 or another 2 to 60 degrees. The 7 or 9.2 are side lengths. Make sure when the 2 angles are set to 60, one of those numbers is at 10. The thing in the upper left says if you double click on a circle, it locks and you can prevent it from changing when the angle reaches 60 this way.

The lengths of the other sides are 10 and 10, and the correct answer is D. 10 and 10.

What is the triangle?

The triangle is a geometric shape that includes 3 sides and the sum of the interior angle should not be greater than 180°

Since a triangle with interior angle measures of 60° and 60° is an equilateral triangle, all sides of the triangle are equal in length.

If one of the side lengths is 10, then the other two sides must also be 10. Therefore, the lengths of the other sides are 10 and 10, and the correct answer is D. 10 and 10.

Answers A, B, and C are not correct because they involve sides of different lengths, which is not possible in an equilateral triangle.

Learn more about triangles here:
https://brainly.com/question/2773823

#SPJ5

Tamara finds the sum of two number cubes rolled at the same time. The chart below shows all possible sums from the 36 possible combinations when rolling two number cubes. How many times should Tamara expect the sum of the two cubes be equal to 3 if she rolls the two number cubes 180 ​times?

Answers

Answer:

about 16

Step-by-step explanation:

The natrual chance of getting 3 =

1/11

180/1 x 1/11

180/11 = 16.36

about 16 times

Answer:

Tamara should expect the sum of the cubes to be equal 3 20 times

Step-by-step explanation:

Imagine you live in a big country. There are no forests in your country, but there are lots of farms and lots of food. The country next door is full of forests. This country also doesn’t have enough food, so it wants to cut a lot of the forests down to make farms. If the neighboring country does this, it will change the climate of your country, making it drier. What do you think would be a good solution to this problem?

Answers

Trading your food for the neighboring country's wood. You can control how much wood they cut down, slowing down the change of climate in your country, and can help them with their food shortage at the same time.

one side of the country could farm and the other keep the forests and trade with each other

1. At the book sale, all books cost less than $5.

What is the most expensive a book could be? $[4.99]
Write an inequality to represent costs of books at the sale.

Answers

Answer:

X [tex]\geq[/tex] $4.99

Step-by-step explanation:

since all the books is less than $5 all books would have to be less tnan or equal to $4.99

Pls answer correctly thank you : )

Answers

Answer:

The answer is B. Equation I only

Step-by-step explanation:

Looking at our three-equation we can see if they are linear, or by graphing the equations. You could make a table by having input/output values (x,y) meaning plugin x = 0 into the equation to get y = a number just to confirm it to help graph if you can't use graphing calculator.

I have used Desmos Graphing Calculator to graph them for a visual view in demonstrated these equations are different from each other.

i. y = 2/3 x is surely a linear line. The slope is 2/3.

ii. y = 3x^2 is a parabola.

iii. y = 3/x is something. I forgot the name of it.

Answer:

The answer is B.

Step-by-step explanation:

Looking at our three-equation we can see if they are linear, or by graphing the equations. You could make a table by having input/output values (x,y) meaning plugin x = 0 into the equation to get y = a number just to confirm it to help graph if you can't use graphing calculator.

I have used Desmos Graphing Calculator to graph them for a visual view in demonstrated these equations are different from each other.

i. y = 2/3 x is surely a linear line. The slope is 2/3.

ii. y = 3x^2 is a parabola.

iii. y = 3/x is something. I forgot the name of it.

Please help, i will give brainliest if possible (2 questions)

Thanks!!

Answers

Answer:

1st page:

A. 28

B. 24

C. The answers were different because out of the 24 students, some played more than 1 sport

Step-by-step explanation:

I can’t help with 2nd page, Sorry!

The sides of a square field are 28 meters. A sprinkler in the center of the field sprays a circular area with a diameter that corresponds to a side of the field. How much of the field is not reached by the sprinkler? Round your answer to the nearest hundredth. Use 3.14 for π

(Please answer quickly)

Answers

if a field is 900 meters squared and one side is twice as big as the other how big is each side

A hot air balloon is at an elevation of 3,700 feet.

If the balloon descends at a constant rate of 45 feet in 112 minutes, how long would it take for the balloon to reach 1,600 feet?

Enter the correct answer in the box.

Answers

Answer:

bhd2efqefrgrgrg

Step-by-step explanation:

What are the approximate zeros of the function y=x^2 + 3x - 5 to the nearest tenth?

A) -4.2 and 1.2
B) -3.9 and 0.8
C) -3.9 and 1.2
D) 1.2 and 4.2


PLS ANSWER QUICKLY I GIVE POINTS!!!

Answers

Answer: A

Step-by-step explanation:

Used graphing app T-E-E-H-E-E

the answer would be A u can use desmos to help :))

question is in the pic

pls include step by step if possible

Answers

Answer:

34

Step-by-step explanation:

(x + 12) + 100 + x = 180

2x + 112 = 180

2x = 68

x = 34

A standard die is a cube with sides measuring 15 mm. What is the volume of the die?

Answers

Answer:

3375mm^3

Step-by-step explanation:

15*15=225

225*15=3375

3375mm^3 is the volume of the die.

Answer:

3,375mm²

Step-by-step explanation:

Since each side of a cube is the same length, that means that we will just have to do 15mm*15mm*15mm to get our answer.

V = L x W x H

= 15 x 15 x 15

= 3,375

Hence, the volume of the die is 3,375mm²

Which line segments are a chord of K?







FG

DK

IJ

HE

Answers

Answer:

D E H

Step-by-step explanation:

connected to K

Answer:

THE ANSWER IS D E F G

Step-by-step explanation DO AS I SAY JK

I need help im staying up all night doing this welp

Answers

8 x 6 2/3 = 53.3

53.3 x 15 = 799.5

799ft is the answer I believe
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