Abookstore advertises 5 notebooks for $7.50. at this rate, how much would 8 notebooks cost

Well first you need to divide 7.50 by 5 . You get 1.50 so then you multiply 1.50 by 8 & get $12

Hi!

The answer would be $12 , because if we multiply 7.50 by 8 we get 60 and when we divide that by 5 we get 12.

8 notebooks would cost $12

Proportion :
5 nb/8 7.50/x

Cross multiply
7.50 times 8=60
60 divided by 5=12

It would be 15 m how i got the answer: (20x20) + b^2 = (25x25)400 + b^2 = 625625-400=225square that and get 15hope this : )

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