Please help!

The vertex of a parabola is (3,0) and a= -1. Which of the following functions represents the parabola?

A. y= -x^2 + 3
B. y= x^2 - x + 3
C. y= -x^2 + 6x -9
D. y= x^2 - 6x + 9

Mr switzer needs to buy new 1-foot tiles to cover his bathroom floor. the floor is 12 feet long and 8 feet wide. each square foot of tile will cost $1.79. in dollars what will be the total cost of the tiles he needs to buy.

Simplify the expression and find the missing terms. the simplest form of has in the numerator and in the denominator.

Atorch and a battery cost 2.50 altogether.the torch costs 1.50 more than the battery.what fraction of the total price is the torch? give your answer in its simplest form.