Question

Use the cubic model y = 5a3 - 2a2 + a - 45 to find the value of y when x = 4.

Answer 1

Assuming 5a3 equals 5a^3, and the same for everything else, you would plug in 4 for a, so 5(4)^3 - 2(4)^2 + 4 - 45, which equals 247.