SOLUTION: Which sequence matches the recursive formula? an = 2an-1 + 5, where a1 = 5 A) 5, 10, 15, 20, ... B) 5, 15, 35, 75, ... C) 5, 15, 25, 35, ... D) 5, 20, 35, 50, ...

Question 1026568: Which sequence matches the recursive formula? an = 2an-1 + 5, where a1 = 5
A) 5, 10, 15, 20, ...
B) 5, 15, 35, 75, ...
C) 5, 15, 25, 35, ...
D) 5, 20, 35, 50, ...
Found 2 solutions by stanbon, FrankM:
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
Which sequence matches the recursive formula?
an = 2*an-1 + 5, where a1 = 5
a(1) = 5
a(2) = 2*5+5 = 15
a(3) = 2*15 + 5 = 35
a(4) = 2*35+5 = 75
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Cheers,
Stan H.
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A) 5, 10, 15, 20, ...
B) 5, 15, 35, 75, ...
C) 5, 15, 25, 35, ...
Answer by FrankM(1040) (Show Source): You can put this solution on YOUR website!
an = 2an-1 + 5 reads to me "double the number and add 5"
If we start with 5, the next number is 2*5=10 10+5 = 15
then 15*2 = 30 30+5 =35
Looks like choice B) 5, 15, 35, 75, ...
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