Integral Calculus

Would you know how to find the area bounded by the vertical line x=2, x=9, the x-axis and the line g(x)?
 
View attachment 24007Can someone please explain how to solve this !
Let us calculate the area of "vertical" rectangle, of width = dx, at a distance x from the origin, and bounded by the curves f(x) and g(x).

The width of the rectangle is = dx

height of the rectangle = g(x) - f(x)

Area of the rectangle = [g(x)-f(x)] dx

Now what.......

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If you are not taking a Calculus class where did you get this problem?

If you are taking a Calculus class then you should know that the area between the graph of y= f(x) and y= g(x), with f(x)> g(x), is \(\displaystyle \int f(x)- g(x) dx\).

Here the area is given by \(\displaystyle \int_2^9 [(0.1x+ 4)- (1- e^{x/6})]dx= \int_2^9 (0.1x+ 3+ e^{x/6}) dx\). Do you know how to do that integral?
 
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