If a bag contains 12 quarters, 6 dimes, and 18 nickles, what is the part-to-whole ratio of quarters to all coins?

Given the two similar triangles, how do i find the missing length? if a=4, b=5, and b'=7.5 find a'

Thanh and her crew are building a stage in the shape of a trapezoid for an upcoming festival. the lengths of the parallel sides of the trapezoid are 14 ft and 24 ft. the height of the trapezoid is 12 ft.what is the area of the stage? enter your answer in the box. ft²

Awindow has the shape of a rectangle with a semi circle at the top. find the approximate area of the window using the dimensions shown. 4ft by 8ft