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Urgent help calculus

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If the area in square units of the region under the curve of the function f(x)=5, on the interval from x=a to x=8 is 20 square units what is the value of a?

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  • Urgent help calculus -

    you have a rectangle with height 5 and width 8-x.

    So, 5(8-a) = 20
    8-a = 4
    a = 4

    No need for calculus here!

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