Answer to Question #53276 in Math for quamrul

Question

The nth derivative of the function t(x) where t(x)=5x^6 - 9x^5 +3x^3 - 0.5 is a cubic function.
(a)State the value of n.
(b)Find the ratio of coefficient in x^3 to the coefficient in x^2 of the cubic function giving your answer in the form 1:k(1 is to k)where k is a fraction in its simplest form.