Question

please help me with this question.
solve it.
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Answer 1

Step-by-step explanation:

18 is the answer of your questions

Answer 2

Answer:

x=24cm

Step-by-step explanation:

let the length of the side of the chess board ne x cm. then,

Area of 64 squares =(x-4)^2

(^2) means whole square of (x-4)

Therefore,

(x-4)^2 = 64×6.25

x^2-8x+16=400

x^2-8x-384=0

x^2-24x+16x-384=0

(x-24) (x+16)=0

x=24cm

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