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7-90.

The limit below represents a definite integral. Fill in the blank:
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To make this easier, factor the 6 out of the limit.
The 6 will be factored out of the integral as well.
We will now write all n-terms as x-terms.

Find dx:

Find the integrand:
x is a variable. So find the part of the sum that changes:

So the integrand must be f(x) = x + 3.

Find the bounds:
Look at the original sum.