Sat/act math questions help!!!
The graph of y= -5x^2+9 passes through (1,2a) in the standard (x,y) coordinate plane. What is the value of a?
Discount tickets to a basketball tourney sell for $4.00 each. Enrico spent $60.00 on discount tickets, $37.50 less than if he had bought the tickets at the regular price. what was the regular ticket price?
For what value of a would the following system of equations have an infinite number of solutions?