Answer:
The answer is C. y-value when x = 5
Explanation:
The two equations f(x) = x^2 and g(x) = 3x^2 are related to each other. f(x) is the most basic version of this curve. g(x) has just had one little change made to it, its been times by 3. That small change stretches the curve kinda taller (vertically) So the vertex, axis of symmetry and direction of opening are all the same.
What is not the same is if you pop in x = 5 to the two equations.
f(x) = x^2 = 5^2 = 25
g(x) = 3x^2 = 3•25 = 75
So, the answer is C. y-value when x = 5