Answer:
variable, In algebra, a symbol (usually a letter) standing in for an unknown numerical value in an equation. Commonly used variables include x and y (real-number unknowns), z (complex-number unknowns), t (time), r (radius), and s (arc length).
Answer:
r= -189
Step-by-step explanation:
This what it should look like. did you need the steps or no ?
The answer is B. Plug in x^2 for f(x) which is y=-1/4x^2
The vertex is (0,0)
The focus is (0,-1)
The directrix is y=1
Graph is B.
