9x^2 - 4y - a
evaluate the expression given
x = -2, y = 3, a = -4

If a flying disk is 139 meters in the air and travels at an average of 13 m/s how long is it in the air

For the right triangle shown, the lengths of two sides are given. find the third side. leave your answer in simplified, radical form.

The plant were you work has a cylindrical oil tank that is 2.5 feet across on the inside and 10 feet high. the depth of the oil in the tank is 2 feet. about how many gallons of oil are in the tank?