5(x+3)-5
simplify this.

What are the measures of ∠a, ∠b, ∠c and ∠d? explain how to find each of the angle measure.

Find the midpoint m of z1=(8+5i) and z2=(12+3i)

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