Which statements are true? choose all answers that are correct. all rhombuses are parallelograms. some rectangles are squares. all squares are parallelograms. all 4-sided shapes are parallelograms.

The fence around a quadrilateral-shaped pasture is 3a^2+15a+9 long. three sides of the fence have the following lengths: 5a, 10a-2, a^2-7. what is the length of the fourth side of the fence?

At the beginning of 1974/75,2 years a man invested #2000 in a bank at 12.5% compound interest, if it degree #650 at the end of each two years to pay his son's school fees, after payment of interest to pay his son's school fees, how much did he have left at the beginning of the 1978/79 school year?

Secant be and cf intersect at point d inside a what is the measure of cde