Please correct the wrong (red) parts

(1:2 Consider the function f(z) = ? + 4. 2 2 In this problem you will calculate / (13? + 4) dm by using the denition 0 b n / f(:c) d1: = ill1)]; [Z f(:vi)A:c:| i=1 The summation inside the brackets is R, which is the Riemann sum where the sample points are chosen to be the righthand endpoints of each sub-interval. {[2 Calculate R" for f($) = ? + 4 on the interval [0, 2] and write your answer as a function of 71 without any summation signs. You will need the summation formulas 1:2+3:~~~:n 22' \"(71+) "+71 i=1 2 2 l " , n(n+1)(2n+1) 2n3+3n2+n 6 _ 6 ' Show hint lim Rn: nwo The graph of y = f(t)at, where f is a piecewise constant function, is shown here. (a) Over which interval is f positive? f > 0 over (0,1) U(3,4) help (intervals) b) Over which interval is f negative? f