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7-56.

Multiple Choice: Evaluate the expression $\int _ { 0 } ^ { 400 } ( 5 ^ { x } - 2 ^ { x } ) d x + \int _ { 1 } ^ { 400 } ( 2 ^ { x } - 5 ^ { x } ) d x$ .

$0.000$

$≈ 1.043$

$≈ 0.221$

$≈ 1.820$

$+∞$

Hint:

Factor a ( $−1$ ) out of the second integral and see what happens.

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