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Naddik [55]
2 years ago
15

Helppppppppppppp!!!!!!

Mathematics
2 answers:
n200080 [17]2 years ago
8 0

Question 1:

For this case, let the variable "x" be the number of girls in the classroom. Let the variable "y" be the number of boys in the classroom.

We propose the equations:

x + y = 22\\x = y + 12

We substitute the second equation in the first:

y + 12 + y = 22\\2y = 22-12\\2y = 10\\y = 5

So, in the classroom there are 5 boys.

x = 5 + 12\\x = 17

So, there are 17 girls.

Answer:

5 guys

17 girls

Question 2:

For this case we have to:

Let x be the variable that represents the amount of money Jamie has.

Let y the variable that represents the amount of money that Kristen has

We have to:

x = 2y\\x + y = 36

We substitute the first equation in the second:

2y + y = 36\\3y = 36\\y = \frac {36} {3}\\y = 12

Looking for the value of x:

x = 2 (12)\\x = 24

Answer:

So, Jaime you have $ 24 and Kristen you have $ 12.

Question 3:

For this case we have to:

Let "x" be the variable that represents the number of dogs in the Pet Stop.

Let "y" be the variable that represents the number of cats in the Pet Stop.

We have to:

x + y = 15\\4x = y

We substitute the second equation in the first:

x + 4x = 15\\5x = 15\\x = \frac {15} {5}\\x = 3

We look for the value of y:

y = 4x\\y = 4 (3)\\y = 12

So, there are 12 cats and 3 dogs.

Answer:

12 cats

3 dogs

Anon25 [30]2 years ago
6 0

Answer:

<h2>There are 17 girls and 5 boys.</h2>

Step-by-step explanation:

Let b and g represent the number of boys and the number of girls respectively.

Then b + g = 22 (students), and g = b + 12.

Substituting b + 12 for g in b + g = 22 yields:

b + (b + 12) = 22

or:

2b + 12 = 22, or 2b = 10, so that b = 5.

Then g = b + 12 = 5 + 12 = 17.

There are 17 girls and 5 boys.

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MatroZZZ [7]

Answer:

c=__ and a=__

Step-by-step explanation:

767.50=1.25(c)+2.25(a).

366=c+a

normally from here, I would just guess the number of adults and children. It does take a while doing it that way, but maybe you know a quicker way. Hope this helps :)

7 0
2 years ago
A gambler playing blackjack in a casino using four decks noticed that 20% of the cards that had been dealt were jacks, queens, k
Ksenya-84 [330]

Answer:

x = 162 cards need to be dealt with

Step-by-step explanation:

Given:

- Estimation of likelyhood of next card to be queen, a king, or an ace:

                                  ( 64 - 0.2*x ) / ( 208 - x )

Find:

For what values of x is this likelihood greater than 70%?

Solution:

- Use the likely-hood estimation relation and set up the inequality as follows:

                                 ( 64 - 0.2*x ) / ( 208 - x ) > 0.7

                                 ( 64 - 0.2*x ) > 0.7*( 208 - x )

                                   64 - 0.2*x > 145.6 - 0.7*x

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6 0
2 years ago
Help please! I really need it
liq [111]
I think it’s none of those.
Radius is a line that reaches the middle of the circle, so like
——
CA
5 0
2 years ago
How far does the unicycle move if the wheel turns once?
algol [13]

The unicycle moves a distance of 251.20cm if the wheel turn once and the wheel must rotate 32 times to cover a distance of 100m

<h3>Circumference of a circle</h3>

The formula for calculating the circumference of a circle is given as:

C = 2pi r

r is the radius of the circle

a) r = 80/2 = 40cm

C = 2(3.14)(40)
C = 251.20 cm

Hence the unicycle moves a distance of 251.20cm if the wheel turn once

b) Number of revolution * 2pi r = distance covered

n * 2(3.14)(50) = 10000
314n = 10000
n = 10000/314

n =32

Hence the wheel must rotate 32 times to cover a distance of 100m

Learn more on circumference here: brainly.com/question/23986334

#SPJ1

8 0
2 years ago
What is 5.5 divided by 3.5
Harlamova29_29 [7]

5.5 divided by 3.5 is 1.57142857 when solved, but when rounded, you will get 1.6, or 1.57.

Hope this helped!

Nate

5 0
3 years ago
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