I think the answer is c because there is no pattern and linear has to have a pattern so nonlinear doesn't have a pattern. Thats why the answer is c.
J'K'L'M'N', I believe. Unless there is a graph you'd like to link
F(x) = 4 [cos (x)]^2 - 3 = 0
4[cos(x)]^2 = 3
cos(x) = √3 / 2
That happens in the first and fourth quadrants, for the angles 30 degrees and 330 degrees.
Answer: x = 30 degrees and x = 330 degrees
The area of the trapezoid would be 5/8 ft squared.