exam Maths Puzzle Numerical Ability

Find the following. Assume that variables can represent any real numbers.

sqrt ( a+4 )^2

The a+4 should be in parenthesis with an exponent of 2 in a radical sign. I hope I explained that correctly.

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exam Other Question

The length of a rectangular piece of sheet steel is 2 in. longer than the width. Find the exact diemnsions if the area of the sheet is 168 sq. in. Please help w/ the following:

How many real solutions does this nonlinear system have?
{{{x^2+y^2=25}}}
{{{x+y=9}}}

Thank you.