Explain how you can use mental math to perform the following addition 61,438+54,579,+28,562

Find the area of a trapezoid with bases 14 cm and 18 cm and height 10 cm. 160 cm2 140 cm2 180 cm2 126 cm2

The square pyramid has a volume of 441 cubic inches. what is the value of x? 1/7x is the height x is the base

Suzanne began a trip with 18 1/2 gallons of gas in the gas tank of her car if she hughes 17 3/4 gallons on the trip how many gallons does she have left once she finish the trip