Which of the following could not be the lengths of the sides of a triangle

What is (28 + 7 + 6 + 3) x 1/2 show your work

This question awards 100 ! i really don’t want to fail i will also mark you !

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