Identify each situation in which a quantity grows or decays by a constant percent rate per unit interval?

The line y = x + passes through (−3, 7) and is parallel to y = 4x − 1.

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.

Which function has the domain x> -11?