It's a MATLAB problem. The answer is in the box, but you have to explain the line in the box that is questions 17b1, 17b2, 17b3, and 17b4.
For part b, one possible solution is as follows, which would be saved as plot3_17.m:
a = 0.25:0.01:4
b = a + 2
[V, A] = torus3_17(a, b)
plot(a, V, a, A)
% Line b1
% Line b2
% Line b3
% Line b4
Question 17b1: Which part of Line b1 is not specified in the original problem?
Question 17b2: Why is a dot not needed in Line b2?
Question 17b3: Explain what Line b3 is doing.
Question 17b4: Explain what Line b4 is doing.