exam Maths Puzzle Numerical Ability

find the circumference of a circle whose radius is 8 in.

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exam Other Question

-14 -9 18 -(-4 1x 0 - 16 12 -8)= 6 5 10

Ax = -7
Bx = 6
Cx = 4
Dx = -2
Ex = -4
Fx = -3

I have no idea how to solve this for x. Id love to see the steps and primefactorization of the number 20