Y + x + 2y = 8y + 3 << im supposed to solve this and i have no idea what it is.. please help!

Which expressions are equivalent to k/2 choose 2 answers: a k-2 b 2/k c 1/2k d k/2 e k+k

What statement is true? 2x^2-9x+2=-1

After t seconds, a ball tossed in the air from the ground level reaches a height of h feet given by the equation h = 144t-16t^2. after how many seconds will the ball hit the ground before rebounding?