6. Evaluate each definite integral (some require substitution). DO NOT INTEGRATE IN YOUR CALCULATOR a) (x²-4x)dx b) de c)* *9xdx dx x a)-3 b) 0.69; c) 48; d) 0.86; e) 2.33; f) 8.53 e) (In1)² dxe de endt 8) [x√4-xdx 1 7. Determine the area of the specified region. Draw a graph of the functions and shade the appropriate region. (Note: integrate by hand and then use a calculator to check your answer.) a) Area under f(x) = x+1 between x-1 and x-4 b) Area under f(x)=e x between x-1/2 and x-2 c) Region enclosed by y = 2x2 and y = x²+3 a) 1.214 b).471