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20 questions
If f(x)= -9x+12, then f(20)=______________?
-180
192
-192
-168
If f(x)=2x+17, then f(12)=___________.
24
41
17
30
Which sequence is an arithmetic sequence?
3, 6, 2, 7, ...
3, 6, 12, 24, ...
3, 6, 10, 15, ...
3, 7, 11, 15, ...
Which sequence is a geometric sequence with a common ratio of 2?
5, 3, 1, -1, ...
5, 7, 9, 11, ...
5, 10, 20, 40, ...
5, 15, 45, 135, ...
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