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Answer:
c. 2y = f(x)
Step-by-step explanation:
Each point on the red graph is half the distance from the x-axis as the same point on the black graph. That is, the vertical scale factor is 1/2:
y = (1/2)f(x)
Multiplying this equation by 2 gives one that matches an answer choice:
2y = f(x)
