Which complex number has an absolute value of 5?
–3 + 4i
2 + 3i
7 – 2i
9 + 4i

The area of a rectangle is 10 cm^2. one side of the rectangle is x cm. express the perimeter of the rectangle in terms of x and show that this rectangle cannot have a perimeter of 12 cm. the perimeter of the rectangle in terms of x is __ cm