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julsineya [31]
2 years ago
8

Mary pumped 7 gallons of water out of her pool each minute for 63 minutes. What was the total change in the amount of water in t

he pool?
Mathematics
2 answers:
Marina CMI [18]2 years ago
6 0

Answer:

The pool has lost 441 gallons of water

Step-by-step explanation:

Multiply 7 (gallons last per minute) to 63 (the total amount of minutes) and you will get 441 gallons lost in total.

ruslelena [56]2 years ago
5 0

Answer:

The amount of water is 30 gallons a minute

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Compare the doubling times found with the approximate and exact doubling time formulas. Then use the exact doubling time formula
g100num [7]

The population after 15 years become according to the doubling time is 470000000.

According to the statement

We have given that the nation of 200 million people is growing at a rate of 9% per year.And we have to find that the What will its population be in 15 years.

So, For this purpose, we know that the

The doubling time is the time it takes for a population to double in size/value. It is applied to population growth etc.

So,

Population of nation is 200 million and growing at a rate of 9% per year.

So, 9% of the population is

Percentage population = 9/100*200,000,000

Percentage population = 9* 200,000,0

Percentage population = 1800,000,0.

It means 18000000 number of population is increased per year.

So, The total population increased in 15 years is  15*18000000

The total population increased in 15 years is  270000000.

The population after 15 years is 270000000 + 200,000,000

The population after 15 years is 470000000.

So, The population after 15 years become according to the doubling time is 470000000.

Learn more about doubling time here

brainly.com/question/16407547

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6 0
1 year ago
A person wishes to mix coffee worth nine dollars per pound with coffee worth three dollars per pound to get 240 pounds of a mixt
Anastasy [175]
\bf \begin{array}{lccclll}
&amount&price&priced\ amount\\
&-----&-----&--------\\
\textit{9 bucks/lb}&x&9&9x\\
\textit{3 bucks/lb}&y&3&3y\\
-----&-----&-----&-------\\
mixture&240&5&1200
\end{array}
\\\\\\
\begin{cases}
x+y=240\implies \boxed{y}=240-x\\
9x+3y=1200\\
----------\\
9x+3\left( \boxed{240-x} \right)=1200
\end{cases}

solve for "x".

what about "y"? well, y = 240 - x
4 0
3 years ago
Some emoji math, there are more to be solve as well. 15 points for each. Must explain how to get the answers you got.
Maslowich

Answer:

Ladybug=7

clock= 5

bulb= 2

Step-by-step explanation:

there are a whole row of ladybugs that equal 21. 21/3=7.

on the third row, the value we need is 12, 6 won't work because we also have a bulb. so pug in 5, 5+5=10, that means the bulb is 2.

So now that we know the values, lets plug them into the first problem to see if it gives us 14... it does

So we have the correct answers

Also, you can plug in the values for the the bottom numbers and you will get those values

7 0
2 years ago
Read 2 more answers
If you write out all the numbers from 1 to 300, in how many numbers will there be an 8? (Note that 88 only counts as one number
Jobisdone [24]
There is one 8 in each intervals: 1-10, 11-20, 21-30, 31-40, 41-50, 51-60, 61-70, 71-79, 90-100, and ten numbers with 8 in 80-89.
from 1-100, there are a total of nineteen 8's.
So from 101-200, there will be nineteen as well. Same goes for 201-300.
so,
19*3=57
There are fifty seven number with 8 from 1 to 300
4 0
3 years ago
The mean weight of four trucks were 3,700 pounds.The first truck was 3,250 pounds.The second truck was 3,890 pounds.Tue lady tru
9966 [12]

Answer:

4,020

Step-by-step explanation:

mean = average

  • Ideally, in order for us to have a 3,700 pound average, each of the four trucks would be 3,700 pounds. Added up, we would have a total of: 14,800 pounds (3,700×4)
  • Let's see how much pounds we already have:
  • 3,250 + 3,890 + 3,640 = 10,780

Now we need to find how much pounds we are missing: 14,800 - 10,780 =

<h2>4,020 for the fourth truck</h2>
  • Let's check: 3,250 + 3,890 + 3,640 + 4,020 = 14,800
  • 14,800/4 = 3,700 pounds
<h3>Good job! I hope this helps</h3>
3 0
3 years ago
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