exam Maths Puzzle Numerical Ability

The variables r and s represent the lengths of the legs of a right triangle, and t represents the length of the hypotenuse. Find the unknown value. Then tell whether the lengths form a Pythagorean triple.

s=16, t=34

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exam Other Question

2x2 + 3xy -4y2 when x=2 and y=4 i would like to know how they got (-80)
if any one can break it down this is from a sample test for college online
Find two consecutive positive integers such that the sum of their squares is 85.

Thank you!