"I commend Tai for producing a correct method for calculating the total area under the curve. It uses the trapezoid rule, a basic geometrical concept, which is that the area of a trapezoid is the ...

The trapezoids extend vertically, from the x-axis up to the line y = ⅓ x + 9 The ratio r of the A 2 area to the A 1 area is r = 1.375 Find the area of A 3 i.e. the third trapezoid. A 3 ...