posted by joe .
Calculate the total area of the region described. Do not count area beneath the x-axis as negative.Bounded by the line y = 6x, the x-axis, and the lines x = 4 and x = 5
a = âˆ«[4,5] 6x dx = 27
or, since the area is just a trapezoid of height 1,
a = (24+30)/2 = 27