Which explicit rule represents the following arithmetic sequence: 7, 11, 15, 19,
1. an=3+4n
2. an=7+4n
3. an= 4+7n
4. an=7x4^n-1

An incoming airplane is x miles due north from the control tower at an airport. a second incoming airplane is y miles due east of the same control tower. the shortest distance between the two airplanes is z miles. which of the following functions would best model the situation above?

The number 72 lies between what perfect squares

Which function has an inverse that is also a function? a. g(x) = 2x-3 b. k(x) = -9x2 c. f(x) |x+2| d. w(x) = -20