exam Maths Puzzle Numerical Ability

The produce of x and the square of y is t.
I put (x)y^2=t is that correct?

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I hope someone can help me solve this problem:

I need to perform the indicated operation:
11-6/7-7

Thanks,
Ashley Please help. These log word problems are the worst.

A certain radioactive isotope decays at a rate of .25% annually. Determine the half-life of this isotope, to the nearest year.