Which sequence begins with 1 and follows this rule? multiply by 2 and add 1.
a.1, 2, 6, 14, 30
b.1, 3, 7, 15, 31
c.1, 4, 6, 22, 46
d.1, 2, 10, 22, 46

Change the information into an equation and do sequence. pull out any necessary information.
y = 2x + 1
starts at 1... so your first sequence is 1.
plug in x=1 then it becomes 3. then the next sequence you plug in 3 (, the answer to your previous solve) you get 7. continue to do this. next sequence you plug in x=7 into the equation y = 2x + 1.
thus, y = 2(7) + 1 =15... so forth...
therefore the answer is B.

Hope this helps :)

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