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If f(x) = 2x + 1 for x < 1 and f(x) = ax + 2 for x at least 1 is continuous, a equals
A0
B1
C2
D3
Answer & Solution
Correct answer: B. 1
The left limit is 3 and the right value is a + 2, so a + 2 = 3 gives a = 1.
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