Find the the surface area and round to the nearest tenth!

Write a function that matches the description. a cosine function has a maximum of 5 and a minimum value of -5. f (r) =

Factor this polynomial completely x^2-64

Two planes leave an airport at the same time, one flying east, the other flying west. the eastbound plane travels 20 mph slower. they are 1600 mi apart after 2 hr. find the speed of each plane.