HELP!!! This is due in like 15 mins

Solve the equation for b: a= (1/2)(b)(h)

An airplane is flying at an elevation of 5150 ft, directly above a straight highway. two motorists are driving cars on the highway on opposite sides of the plane, and the angle of depression to one car is 35 ̊ and to the other is 52 ̊. how far apart are the cars?

Multiply and simplify 2x^2 y^3 z^2 · 4xy^4 x^2