What is p(a and b) if p(a)=1/2 and p(b)=2/7, where a and b are independent events

If y varies directly as x2 and y=6 when x=6, find the constant of variation.

Which of the following contains a variable?

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