It takes 32 minutes for 3 people to paint 4 walls. How many minutes does it take 4 people to paint 7 walls?

Answers

Answer 1

Answer: we order these data:

32 minutes------------------------3 people------------------4 walls
x--------------------------------------4 people------------------7 walls
The minutes and the people are variables inversely proportional , therefore, we multiply in parallel
32 minutes*3 people=x*4 people

The minutes and the walls are variables directly proportinal; therefore, we multiply cross.
32 minutes*7 walls=x*4 walls

Therefore:
32 minutes*3 people*7 walls=x*4 people*4 walls
x=(32 minutes*3 people*7 walls) / (4 people* 4 walls)
x=42 minutes.

Answer: the time will be 42 minutes.

Answer 2

Answer:

Answer:

Step-by-step explanation:

that is the answer on khan academy

hope that helped!

a thanks would be appreciated! ;)

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Explain how u would multiply 5x21/2
Polynomials - Put in descending order in terms of x:12x²y³ - 6x³y² + 3y - 2x Must answer correctly and thoroughly to get Brainliest Answer and points. Thank you! :D
A prism whose base is a 9-sided polygon is intersected by a plane. In which case could the cross section be a 10-sided polygon?

To form a right triangle, Emil put together three square tiles with side lengths of 12 centimeters, 15 centimeters, and x centimeters. Which statement is true about the area A of the smallest tile?

Answers

Answer: A= 15^2 - 12^2

Step-by-step explanation:

Answer:

yes,because it passes the vertical line test

Step-by-step explanation:

The sign of a positive number divided by a negative number is always: A) Positive B) Negative C) Zero D) Undefined

Answers

Answer:

B) negative

Step-by-step explanation:

The sign of a positive number divided by a negative number is always negative.

E.g:

5 ÷ (-4) = -1.25

_______

hope this helps!

Emily and Rachel had lunch at the mall. Emily ordered two slices of pizza and three cookies and her bill was $8. Rachel ordered one slice of pizza and four cookies and her bill was $9. What was the price of one slice of pizza? What was the price of one cookie?

Answers

Answer:

one slice of pizza: $1

one cookie: $2

Step-by-step explanation:

Emily: two pizzas (1+1)+three cookies (2+2+2)= 8

Rachel: one pizza (1)+four cookies (2+2+2+2)= 9

can i plz get brainilest? :)

Answer:

piza 1 buck

cooky 2 bucks

Step-by-step explanation:

i did not look at the other answer...

lol i copied the other answer

Here are the possible outcomes when a pair of fair dice is rolled.1 2 3 4 5 6
1 2 3 4 5 6 7
2 3 4 5 6 7 8
3 4 5 6 7 8 9
4 5 6 7 8 9 10
5 6 7 8 9 10 11
6 7 8 9 10 11 12

In a roll of a pair of fair dice, what is the probability of the outcome being either a multiple of 3 or an even number? Are these events mutually exclusive?
, mutually exclusive
, not mutually exclusive
, mutually exclusive
, not mutually exclusive

Answers

I don't understand the big table of numbers at the top at all,
and don't see how it relates to the question.

There are 36 possible outcomes for the roll of a pair of dice.
According to your specifications, the successes are:

-- Multiples of 3:
   1 ... 2 (3)
   2 ... 1
   3 ... 3 (6)
   1 ... 5
   5 ... 1
   2 ... 4
   4 ... 2
   3 ... 6 (9)
   6 ... 3
   4 ... 5
   5 ... 4
   6 ... 6 (12)
(12 different outcomes)

-- Even numbers:
   1 ... 1 (2)
   1 ... 3 (4)
   3 ... 1
   2 ... 2
   3 ... 3 (6)
   1 ... 5
   5 ... 1
   2 ... 4
   4 ... 2
   2 ... 6 (8)
   6 ... 2
   3 ... 5
   5 ... 3
   4 ... 4
   4 ... 6 (10)
   6 ... 4
   5 ... 5
   6 ... 6    (12)
(18 different outcomes)

The events are NOT mutually exclusive.
A roll of 6 (5 ways) or 12 (1 way) meets both requirements.

Successful outcomes:
Multiples of 3 . . . . 12
Even numbers . . . 18
       Duplicates . . . . 6

So there are 24 different successful outcomes.

Probability = (24) / (36) = 2/3 = (66 and 2/3) %

An astronaut was exploring the moon of a distant planet, and found some glowing goo at the bottom of a very deep crater. She brought a 10-gram of the goo to her laboratory. She found that when the goo was exposed to light, the total amount of goo increased by 100% every hour. How much goo will she have sfter 1 hour?After 2 hours? After 3 hours? After n hours?

Answers

Answer:

20 ; 40 ; 80 ; 10(2^n)

Step-by-step explanation:

Given that:

Initial amount of goo (p) = 10 gram

Total amount of goo increased by 100% every hour ;

How much goo will she have sfter 1 hour?After 2 hours? After 3 hours? After n hours?

Using the relation :

Final amount = initial * (1 + rate)^t

Rate = 100% = 100/100 = 1

t = number of hours

Hence, after 1 hour :

Final amount = 10(1 + 1)^1

Final amount = 10(2)^1 = 20 grams

After 2 hours : t = 2

Final amount = 10(1 + 1)^2

Final amount = 10(2)^2 = 10 * 4 = 40 grams

After 3 hours ; t = 3

Final amount = 10(1 + 1)^3

Final amount = 10(2)^3 = 10 * 8 = 80 grams

After n hours ; t = n

Final amount = 10(1 + 1)^n

Final amount = 10(2)^n grams

Can someone help me?

Answers

The 9 is in the hundred millions place.

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