Giving free brainliely if you do this

An arc subtends a central angle measuring 7pi/4 radians what fraction of the circumference is this arc?

Two variables, x and y, vary inversely, and x=12 when y=4. what is the value of y when x=3?

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