1. Use only the Riemann definition of the definite integral to find the exact value of (x + 2x - e)dax with : 0 (a) = 1i-1 (b) * = Ti (c) x* equal to the midpoint of [Ti-1, Ti]. Choose the most appropriate answer from the below multiple choices. Make sure to fully justify each of your answers. Let f [3") be a continuous positive function on the interval [1,2]. The area of the region bounded by the graph of f, the LB-axis and the lines :1:=1and:r=2is: {a}lin1 2%f(1+i1) (b}gLH;UZf(1+k:1)% (a) 13\" "' m?) (d) mm (e) All of the above. (f) None of the above