(cos2x+1)(2cosx-1)(2cosx-1)(2cos2x- 1)=2cos8x

The length of each stair is 11 inches. what is the rise, r, for each stair? round to the nearest inch. 2 inches 7 inches 17 inches 24 inches

What are the solutions to the equation 4x2+3x=24-x

Akitchen is 12 ft. by 14 ft. with 10 ft. high walls. how much would it cost to put vinyl flooring in this room? $8.80 per ft