Ask question

Ask question

All categories

3 years ago

9

To complete an English exam, you must write 3 essays from a list of 7 prompts. In how many ways can you complete the exam?

1 answer:

Mashutka [201]3 years ago

8 0

Answer:

35 ways

Step-by-step explanation:

7 nCr 3 = 7!/(3!(7-3)!) = 7!/(3!*4!) = 35

You might be interested in

Justine charges $25 to wash a dog. She washed 5 dogs on Saturday and then some more on Sunday. She made $325 for the weekend. Ho

Marrrta [24]

Answer

• A. Equation: 25(5 + x) = 325

,

• B. Answer: 8 dogs

Explanation

Given

• Charge to wash a dog: $25.

• She washed 5 dogs on Saturday and then some more on Sunday.

• She made $325 for the weekend.

Procedure

She charges $25 per wash, she made $325 for the weekend, and we know that on Saturday she washed 5 dogs, but we don't know how many she washed on Sunday. Thus, we have to build an equation in which the number of dogs washed on Sunday is represented by x (as we do not know the real number).

Considering that the total money made has to be equal to the multiplication of the charge times the dogs washed, the equation is:

$25(5+x)=325$

Then, we have to solve for x to know how many dogs did she wash on Sunday.

0. Multiplying the parenthesis

$125+25x=325$

<em>2. Subtracting 125 from both sides of the equation</em>

$125-125+25x=325-125$ $25x=200$

<em>3. Dividing both sides of the equation against 25</em>

$\frac{25x}{25}=\frac{200}{25}$ $x=8$

8 0

1 year ago

2. The following formula, F = ma, relates three quantities: Force (F), mass (m), and acceleration (a). (a) Solve this equation,

erica [24]

A) F/m=a
B) a would equal -3.4
C) m would equal 3

5 0

4 years ago

Read 2 more answers

you and your friend want to meet up to play fortnite on February 1st what is the probability that the date falls on a Wednesday

LenKa [72]

Answer: 1/7

Step-by-step explanation: There are 7 days in a week. Hope this helps! ~Autumn~

8 0

3 years ago

Read 2 more answers

Readings on a thermometer are normally distributed with a mean of 0C° and a standard deviation of 1.00. What is the probability

hichkok12 [17]

Given mean = 0 C and standard deviation = 1.00

To find probability that a random selected thermometer read less than 0.53, we need to find z-value corresponding to 0.53 first.

z= $\frac{x-mean}{standard deviation} = \frac{0.53-0}{1.00} = 0.53$

So, P(x<0.53) = P(z<0.53) = 0.701944

Similarly P(x>-1.11)=P(z>-1.11) = 1-P(z<-1.11) = 0.8665

For finding probability for in between values, we have to subtract smaller one from larger one.

P(1.00<x<2.25) = P(1.00<z<2.25) = P(z<2.25)- P(z<1.00) = 0.9878 - 0.8413 = 0.1465

P(x>1.71) = P(z>1.71) = 1-P(z<1.71) = 1-0.9564 = 0.0436

P(x<-0.23 or x>0.23) = P(z<-0.23 or z>0.23) =P(z<-0.23)+P(z>0.23) = 0.409+0.409 = 0.918

4 0

3 years ago

Solve for y.<br> 10 = 6 + y

frutty [35]

Y =4
if you replaced y with 4 the equation would be true...

it's easy math
- hope you have a nice day...

6 0

3 years ago

Read 2 more answers