Consider the graph of f(x) = 0.5x2. Use the graph to find a number δ > 0 such that if |x − 4| < δ, then |0.5x2 − 8| < 0.2.
A. 0.09
B. 0.07
C. 0.05
D. 0.01
Answer: C. 0.05
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