exam Maths Puzzle Numerical Ability

If f(x)=3(1/125)^(x-2) +12, then what is the value of x when f(x)=87?

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exam Other Question

Simplify each expression. Rationalize all denominators. Assume that all variables are positive.

cube root of 2x times cube root of 4 times cube root of 2x square Simplify

18r^2t^15/12rt^12