The cost of electricity for a certain town is increasing for 18 months, but not
ID: 2861021 • Letter: T
Question
The cost of electricity for a certain town is increasing for 18 months, but not at a constant rate. For the first 9 months, the rate of growth is increasing. During the second half of the interval, the cost of electricity grows at decreasing rates. Which of the following graphs is a consistent representation for the cost of electricity as a function of time, t? A function f(x) satisfies the following conditions: f is concave down for x - 2 f'(-2) notequalto 0 Which of the following graphs COULD represent f(x)?Explanation / Answer
graph: B
satisfies the conditions of f(x)
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