exam Maths Puzzle Numerical Ability

(4^-2+2^-3)^-4
Totally confused, could someone explain?

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exam Other Question

There are three consecutive odd integers. Three times the largest is seven times the smallest. What are the intergers? 8.f z varies jointly with the product of x and y, find the constant of variation, k, given x=1/2, y=8, z=12.
Enter only the numerical value of k.

9.Using the information in qu