Answer in scientific notation and explain and show work.

Let r = 3. what is the value of r + 58?

Asystem of equations has 1 solution. if 4x-y=5 is one of the equations , which could be the other equation ?

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