Show Step by step working without calculator please

7. [20 Points] Consider the function f(x) = 12 - 4 in the interval [0, 2]. (a) Find the right end point Riemann sum using n = 3. (b) Express the integral for2 - 4dx as the limit of the right end point Riemann sums. (c) Evaluate the limit to find the value of fo x2 - Adx. (Hint:you may use these formulas if necessary Ji = (a+1) and ) 12 _ n(n+1)(2n+1) 2 6