Solve the Problem As a Single Iterated Integral with the Order of Integration

question 372

Multiple Choice

Solve the problem.
-Write
$$\int _ { 0 } ^ { 9 } \int _ { 0 } ^ { y } f ( x , y ) d x d y + \int _ { 9 } ^ { 18 } \int _ { 0 } ^ { 18 - y } f ( x , y ) d x d y + \int _ { 0 } ^ { 9 } \int _ { y } ^ { 9 } f ( x , y ) d x d y + \int _ { 0 } ^ { 9 } \int _ { 9 } ^ { 18 - y } f ( x , y ) d x d y$$
as a single iterated integral with the order of integration reversed.

• A) \(\int _ { 0 } ^ { 18 } \int _ { 9 } ^ { 18 - x } f ( x , y ) d y d x\)
• B) \(\int _ { 9 } ^ { 18 } \int _ { 0 } ^ { 18 - x } f ( x , y ) d y d x\)
• C) \(\int _ { 0 } ^ { 18 } \int _ { 0 } ^ { 18 - x } f ( x , y ) d y d x\)
• D) \(\int _ { 9 } ^ { 18 } \int _ { 9 } ^ { 18 - x } f ( x , y ) d y d x\)

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