Write an equation and then use it to solve: Sasha gives half of her books to the local library and keeps the other half. Her best friend gives her 3 more books. She now has 57 books. How many books did she have to begin with?

120 books

Step-by-step explanation:

57 + 3 = 60

60 x 2 = 120

the answer is b: 18

step-by-step explanation:

use the pythagorean theorem to .

a^2+b^2=c^2

plug 18 for "r"

the 2 legs are 18 and 24

18^2+24^2=c^2

324+576=c^2

900=c^2

c=30

30-12=18

18 is the radius

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