NEED HELP ASAP y=[a]cos ([b](x-[h])+[k]

Let f (x) = x e8x. find a formula for the nth derivative of f, where n is any positive integer. use x and n in your answer if needed. f (n)(x) =

Write the equation for the parabola that has x− intercepts (−2,0) and (4,0) and y− intercept (0,4).

Find the solution set of this inequality. enter your answer in interval notation using grouping symbols. |8x-4| ≤ 12