Question

If the number of books is tripled, then their cost increases ___ times​

Answer 1

Answer:

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Heron's formula states for a triangle with sides of lengths a,b,c

A=

[s∗(s−a)∗(s−b)∗(s−c)]

where s = (a+b+c)/2

If you double the sides A=

[2s∗(2s−2a)∗(2s−2b)∗(2s−2c)]

= 4*A=

[s∗(s−a)∗(s−b)∗(s−c)]

= 4*A

The increase in area is 4*A-A = 3*A so the

Answer (C) 300%

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