4 + 3/40 + 7/60 + 2/50 - 49/600

List x1, x2, x3, x4 where xi is the left endpoint of the four equal intervals used to estimate the area under the curve of f(x) between x = 4 and x = 6. a 4, 4.5, 5, 5.5 b 4.5, 5, 5.5, 6 c 4.25, 4.75, 5.25, 5.75 d 4, 4.2, 5.4, 6

What multiplys to be 1 but adds up to be 4

Solve the equation for b: a= (1/2)(b)(h)