Let ƒ Be an Integrable Function on [A,b] $\int _ { a } ^ { b } f ( x ) d x = f ( x ) ( b - a )$

Multiple Choice

Let ƒ be an integrable function on [a,b]. Which of the following is always true?

A) $\int _ { a } ^ { b } f ( x ) d x = f ( x ) ( b - a )$
B) $\int _ { a } ^ { b } f ( x ) d x = \int _ { a / 2 } ^ { b / 2 } 2 f ( x ) d x$
C) $\int _ { a } ^ { b } f ( x ) d x = \frac { 1 } { 2 } \int _ { 2 a } ^ { 2 b } f ( x ) d x$
D) $\int _ { a } ^ { b } f ( x ) d x > 0$
E) is bounded. $\int _ { a } ^ { b } f ( x ) d x$