Which number is divisible by 2,9 and 10
(a) 45
(b) 60
(c) 90
(d) 150

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).

Which of the following best describes the delian 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