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stiv31 [10]
2 years ago
12

Sandy has 31 books in her library. She bought several books at a yard sale over the weekend. She now has 59 books in her library

. How many books did she buy at the yard sale
Mathematics
1 answer:
Tatiana [17]2 years ago
8 0
28 books. 59(current books) - 31(past books) equals the amount of books Sandy bought, which is 28 books. Hope it helped
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\boxed{a=\frac{r+d}{c}}

<h2>Explanation:</h2>

Here we have the following expression:

ac=r+d

And the question asks for solving the equation for the variable a. So we need to divide both sides of the equation by c:

ac=r+d \\ \\ \frac{ac}{c}=\frac{r+d}{c} \\ \\ \\ But: \\ \\ \frac{c}{c}=1 \\ \\ \\ So: \\ \\ \boxed{a=\frac{r+d}{c}}

<h2>Learn more:</h2>

Solving equations: brainly.com/question/10643312

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Answer:

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Step-by-step explanation:

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