Which phrase matches the algebraic expression below 3(x+7)+10

Plz me plz i need and plz delte this after answer

Select the correct answer. what is the exact value of sin (157.5°)? a. 'sqrt(2 - sqrt(2))/2 b. *"-"'sqrt(2 + sqrt(2))/29 c.'sqrt(2 + sqrt(2))/4" d. "-"sqrt(2 + sqrt(2))/4)

Solve each quadratic equation by factoring and using the zero product property. x^2 + 18x = 9x