Solve the Problem $f$ And $g$ Are Continuous and That $\int _ { 5 } ^ { 9 } f ( x ) d x = - 6$

question 121

Multiple Choice

Solve the problem.
-Suppose that $f$ and $g$ are continuous and that $\int _ { 5 } ^ { 9 } f ( x ) d x = - 6$ and $\int _ { 5 } ^ { 9 } g ( x ) d x = 8$ . Find $\int _ { 5 } ^ { 9 } [ 4 f ( x ) + g ( x ) ] d x$

• A) 26
• B) -16
• C) 8
• D) 12

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