Crossing a long stretch of the canadian plains, passenger trains maintain a steady speed of 80 mph. at the speed, what distance is covered in half an hour? how much time is needed to cover 200 miles?

What expression is equivalent to (2x-1)(x-3)?

Three friends are comparing the prices of various packages of golf balls at a sporting goods store. hector finds a package of 6 golf balls that costs $4.50.

The volume of a spherical hot air balloon v(r) = 4 3 ? r3 changes as its radius changes. the radius is a function of time given by r(t) = 3t. find the instantaneous rate of change of the volume with respect to t at t = 2.