For simple harmonic motion equation d=9cos(pi/2t) what is the frequency

Given the function f(x) = 3x + 1, evaluate f(a + 1). a. 3a + 1 b. a + 2 c. 3a + 4

In the xy-plane, if the parabola with equation passes through the point (-1, -1), which of the following must be true?

Val and tony get paid per project. val is paid a project fee of $44 plus $12 per hour. tony is paid a project fee of $35 plus $15 per hour. write an expression to represent how much a company will pay to hire both to work the same number of hours on a project.