A. -3
B. -4
C. -2 and 1
D. 0

The answer would be C. This is because f(x) is the y intercept so when it says what values of x does f(x) = -4, it is asking which numbers are on the x-axis when the y-axis is equal to -4. On the graph, the point where the y-axis is at -4, the x-axis is at -2 and 1. Hope this helps :)

B, 0.4 repeats so it is rational and square root of 16 is 4 so that is rational as well.

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