book Maths Puzzle Numerical Ability

Can you please help me solve this problem? z^2-{y+3)^2

Thank you in advance for your help.

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book Other Question

If Cathy had earn one fourth of a percent more in annual interest on an investment, the interest for one year would have been $85 greater. How much money did she invest at the begg Moms age is Dads age reversed. Dad is older than mom. Dads and moms age are equal to 11 times the difference between moms and dads age.

This is what I have so far...

M+D =