How to change from slope intercept form into standard form

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

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)

Find the length of the radius of a circle with the center at -7+2i and a point in the circle at 33+11i