A quadratic function f is given. f(x) = x2 − 4x
(a) Express f in standard form.
(b) Find the vertex and x- and y-intercepts of f. (If an answer does not exist, enter DNE.)v
(c) Find the domain and range of f. (Enter your answers using interval notation.)

The answer would be the second choice : )

She will need 5/8 bags for each square yard.

Period is the time it takes for one “cycle” to complete. in the parent sine function, period is 2*pi since sin(0) = 0, sin(pi/2) = 1, sin(pi) = 0, sin(3pi/2) = -1, and sin(2pi) = 0. at that point, the sequence repeats itself. i’m not sure if your graph is similar to the sine function since you didn’t provide a picture, but you can find the period by looking at a graph.