(n^4× 2n^-1)^-2 step by step

What is the average rate of change for this function for the interval from x=2 to x=4 ?

Ineed with question three. i don't understand how i'm supposed to achieve 3 marks.

Ven the functions, f(x) = 5x2 - 3x + 1 and g(x) = 2x2 + x - 2, perform the indicated operation. when applicable, state the domain restriction. (f - g)(x) 3x2 - 4x + 3 3x2 - 2x - 1 3x2 - 4x - 1 3x2 - 2x + 3