book Maths Puzzle Numerical Ability

Solve for t and find the digit that equals a: [3(230+t)]^2=492,a04

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book Other Question

How do I figure this out?

Amy's grades for each component of the course and the weight of each component for the course are:
Component Weight Gr Find the inverse of the given function. f(x) = squareroot of (x-10).

Is there a solver for inverse functions?

Thanks