a) First we sketch the graph and the rectangles,
f(x) = 3x + 2
which is a linear equation with y-intercept 2
also at x = 3, f(x) = 3(3) + 2 = 11
which matches the third sketch shown
Therefore the total area is given as,
A = 0.5 x 3.5 + (0.5 x 5) + (0.5 x 6.5) + (0.5 x 8) + (0.5 x 9.5) + (0.5 x 11)
A = 21.75 sq. units
(b)
First we sketch the graph and the rectangles,
f(x) = 3x + 2
which is a linear equation with y-intercept 2
also at x = 2, f(x) = 3(2) + 2 = 8
which matches the first sketch shown
Therefore the total area is given as,
A = (0.5 x 2) + (0.5 x 3.5) + (0.5 x 5) + (0.5 x 6.5) + (0.5 x 8) + (0.5 x 9.5) =
A = 17.25 sq. units
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