True or false, -|21| is always positive

If f(x)=2x-6 and g(x)=3x+9, find (f-g)(x)

Add the fractions, and simply the result to lowest terms. 2/3 + 2/7= ?

Adecorative window is made up of a rectangle with semicircles at either end. the ratio of ad to ab is 3: 2 and ab is 30 inches. what is the ratio of the area of the rectangle to the combined area of the semicircles? possible answers: a. 2: 3 b. 3: 2 c. 6: π d. 9: π e. 30: π