If by d2 you mean d squared then it is non linear
It is linear in c and non-linear in d. If both c and d are variables, then it is non-linear.
36 inches = 3 feet
27 + 9 = 36
36+27=63
16 + x = 36x = 36 - 16 = 2016 + 20 = 36
It is linear in c and non-linear in d. If both c and d are variables, then it is non-linear.
36 inches = 3 feet
132
72
62
36 inches plus what?
27 + 9 = 36
36 + 12 = 48
21 + 15 = 36
36+27=63
51
45