Estimate the area under the graph of f(x) = x2 + 3x from a = 5 to a = 11 using 3 approximationg rectangles and left endpoints. Approximation =Let 3 3 f(x) dx = -7, f(x) dx = -10, g(x) dx = -15, g(x) dx = -4, Use these values to evaluate the given definite integrals. ) / ( f (z ) + 9(2)) de = b) (f (x) - g(x) ) dx = c ) (3f(x) + 2g(x)) dx = d) Find the value a such that (af(z) + g(x)) da = 0. a =16.8 8.8 47.2 A graph of f is shown above. The numbers shown represent the geometric area of each region. Evaluate the following definite integrals. a ) ( f(x) dx = b ) ( f ( x ) do = c ) ( f( ) da =