Which expression is equivalent to (sin x + 1)(sin x − 1)? a. cos2x b. -cos2x c. cos2x + 1 d. cos2x − 1 e. -cos2x + 1

Atriangle with all sides of equal length is a/an triangle. a. right b. scalene c. equilateral d. isosceles

Which shows the correct substitution of the values a,b and c from the equation 1=-2x+3x^2+1

Sophia wrote an equation to represent the revenue of a movie theater for one day. she let x represent the number of child tickets sold and y represents the nunver of adult tickets sold. if a child ticket cost $4, an adult ticket cost $6, and the total revenue for the daybwas $420, which equation could sophia use to represent the number of chikd and adult tickets that were sold?