exam Maths Puzzle Numerical Ability

Parellelogram has consecutive side lengths of 9 and 7 and diagonals of integral lengths. How long are the diagonals?

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exam Other Question
Simplify by taking roots of the numerator and denominator. Assume that all expressions under radicals represent positive numbers.

^3sqrt((1000x^5)/(y^3))

Thank you so very much~ Could someone please help me with this problem?
Part A.. Solve A=P+Prt for P if r=0.07, t=3, A=4646.40



Part B.. Solve A=1/2h(a+b)for b if a=3.2, h=12, A=51.6

Thank you for your help!!!!!!