Derive the equation of the parabola with a focus at (0, −4) and a directrix of y = 4.

a.) f(x) = −16x^2
b.) f(x) = 16x^2
c.) f(x) = −1/16 x^2
d.) f(x) = 1/16 x^2

Look at the following graph of the given equation. determine whether the equation is a function. explain why or why not.

Players on the school soccer team are selling candles to raise money for an upcoming trip. each player has 24 candles to sell. if a player sells 4 candles a profit of$30 is made. if he sells 12 candles a profit of $70 is made

Need ! 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?