Using the equation y=ax^2+bx+c to represent a parabola on a graph, which statement is true?
(1) if b is negative, the parabola opens downward.
(2) if a is negative, the parabola opens upwards.
(3) if a is positive, the parabola opens upwards.
(4) if c is negative, the parabola opens downwards.

Someone answer asap for ! the total ticket sales for a high school basketball game were $2,260. the ticket price for students were $2.25 less than the adult ticket price. the number of adult tickets sold was 230, and the number of student tickets sold was 180. what was the price of an adult ticket?

3.4a=57.8 what is the the value of a

Solve for x where 0 equation: cot^2x+2cotx+1=0