brief calc
posted by joe .
Calculate the total area of the region described. Do not count area beneath the xaxis as negative.Bounded by the line y = 6x, the xaxis, and the lines x = 4 and x = 5

brief calc 
Steve
a = âˆ«[4,5] 6x dx = 27
or, since the area is just a trapezoid of height 1,
a = (24+30)/2 = 27
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