Final if x varies directly as y, and x=20 when y=4, find x when y=9

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?

Avideo game enthusiast saved $750 to spend on a video game player and games. the player costs $400. the games costs $49 each. at most how many games can this enthusiast buy along the player

Three lines meet at a point. set up and solve an equation to find the value of (a) is your answer reasonable? explain how you know