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2 years ago

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Colton is filling 5 aquariums with water. Each aquarium needs 72 gallons of water. About how many gallons of water are needed to

fill all the aquariums? A. about 14 gallons B. about 70 gallons C. about 350 gallons D. about 500 gallons

1 answer:

Natali5045456 [20]2 years ago

4 0

A. about 14
divide 72/5= 14.4 which rounds to 14

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Answer:

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Step-by-step explanation:

Fact:

$\begin{aligned} & (a - b)\, (a + b)\\ =\; & a^{2} + a\, b - a\, b - b^{2} \\ =\; & a^{2} - b^{2} \end{aligned}$ .

In other words, $(a^{2} - b^{2})$ , the difference of two squares in the form $a^{2}$ and $b^{2}$ , could be factorized into $(a - b)\, (a + b)$ .

In this question, the expression $(9\, w^{2} - 100)$ is the difference between two terms: $9\, w^{2}$ and $100$ .

$9\, w^{2}$ is the square of $3\, w$ . That is: $(3\, w)^{2} = 9\, w^{2}$ .
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$9\, w^{2} - 100 = (3\, w)^{2} - (10)^{2}$ .

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<h2>SOLVING</h2>

$\Large\maltese\underline{\textsf{A. What is Asked}}$

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_______________________________________________________

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