a Approximate the area under graph a of f x 2 x over the interval 1 9 by computing the area of each rectangle to four decimal places and then adding b Approximate the area under graph b of f x 2 x over the interval 1 9 by computing the area of each rectangle to four decimal places and then adding Ay 2 1 0 Ay 2 1 1 0 1 2 3 f x 21x 5 x 27x1 3 4 5 7 6 7 80 a 9 b 9 X X Q Q C The area under graph a is approximately Round to four decimal places as needed