C is the answer I took a similar test
Since 470/6 = 78.333 it would take you 78.333 days to work 470 hours.
Answer is D, 2(4a + 7.)
A is equivalent to 4a + 24.
B is equivalent to 16a + 40.
C is equivalent to 8a + 32.
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Answer:
If a, b and c are in arithmetic progression, that means that a + c = 2b. So a + b, a + c and b + c are also in arithmetic progression.
This might help.
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