How to evaluate 2^3-(-3)^3

Solve the given system of equations. 2y= -x+9 , 3x-6= -15

Aprojectile is thrown upward so that its distance above the ground after t seconds is given by the function h(t) = -16t2 + 704t. after how many seconds does the projectile take to reach its maximum height?

James was playing a game with his friends. he won 35 points. then he lost 15, lost 40 and won 55. how did he come out