Currently, you have a 90, 78, 88, and an 80 on your
tests in math. what do you need to make on the next test
in order to get an average of an 85? .

The input to the function is x and the output is y. write the function such that x can be a vector (use element-by-element operations). a) use the function to calculate y(-1.5) and y(5). b) use the function to make a plot of the function y(x) for -2 ≤ x ≤ 6.