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1 answer:
<h2>Hello!</h2>
The answer is: The square root of 72 is 8.5
<h2>Why?</h2>To solve this problem we need to remember how to operate with square roots.
So, we are asked to estimate the square root of 72, to find the problem, we need to factor 72, and then, apply the square root property.
Now, since 36 is a perfect square (it can be obtained by squaring a whole number), we have:
Then, we have that 8.48 rounded to the nearest tenth is equal to 8.5.
Hence, we have that , the square root of 72 is equal to 8.5.
Have a nice day!
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Answer:
10
Step-by-step explanation:
We will use a system of equations to solve this. We do not know how much of the 25% bleach solution is used; we will use x to represent this. We know that 5 cups of the 10% solution was used. We do not know how much of the resulting solution we have; we will use y to represent this. This gives us the equation
x+5 = y
Using the decimal forms of the percentages for each solution, we have 0.25x (25% solution for x cups), 0.1(5) (10% solution for 5 cups) and 0.2y (20% solution for y cups); this gives us the equation
0.25x+0.1(5) = 0.2y
This gives us the system
To use elimination, we will make the coefficients of x the same by multiplying the top equation by 0.25:
We will now subtract the second equation from the first:
Divide both sides by 0.05:
0.75/0.05 = 0.05y/0.05
15 = y
There were 15 cups of the resulting 20% solution. Substituting this into the first equation, we have
x+5=15
Subtract 5 from each side:
x+5-5=15-5
x = 10