Find the exact value of sin(7pi/8)

According to statistics a person will devote 32 years to sleeping and watching tv. the number of years sleeping will exceed the number of years watching tv by 18. over a lifetime, how many years will the person spend on each of these activities

If y varies directly as x2 and y=6 when x=6, find the constant of variation.

Solve each quadratic equation by factoring and using the zero product property. 10x + 6 = -2x^2 -2