exam Maths Puzzle Numerical Ability

Find the area of a rectangle with length 4 and diagonal 5.

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exam Other Question

Evaluate (-7z)2 and -7z2 when z=10 (Both 2's are the little 2's above the letter/parenthisis.)

Help me with this please. Please help me solve this problem:

A teacher is 15 years older than her student.
In 15 years, the ratio of their aages will be 3:2.
Find their present ages.