exam Maths Puzzle Numerical Ability

Simplify

(20 x 10 -4 power)(4 x 10 nine power)/3,200 x 10 -3 power

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exam Other Question

solve the following system by substitution

5*x-2*y=-5
y-5x=3
Please help I am lost I do not understand how to factor the following binomials

64y^2- x^2