Which of the following is not equal to -6t^2 - t? (a) - (6t^2+t )
(b) (t^2 +8t)-(7t^2 +9t)
(c) (3t^2 - 5t)-(-5t^2 - 4t)
(d) (2t^2 - 3t+1) -(8t^2 - 2t + 1)​

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