What's the solution of 6(3-2x)=54 ?

What is the simplified form of (3.25x10^3)(7.8x10^6) written in scientific notation?

What’s the answer ? use the picture to see the problem

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