If mike bikes at a speed 10 mph for half an hour, how far would he go? what was mike's speed (in average) if he covered the distance of 18 miles in 2 hours?

Ineed to know the answer to this algebra question.

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

At oaknoll school, 90 out of 270 students on computers. what percent of students at oak knoll school do not own computers? round the nearest tenth of a percent.