The points A, B, C and D divide the line segment AD in the ratio 21 : 11 : 5, respectively, and AB = 30cm:

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.