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In a certain sequence of numbers, each term after the first is found by doubling and then adding $3$ to the previous term. If the seventh term of the sequence is $125$, what is the first term?

Respuesta :

frika
Given [tex]a_7=125[/tex] you can find a_6:

[tex]a_6= \frac{125-3}{2} =61[/tex]
 [tex]a_5= \frac{61-3}{2} =29 \\ a_4= \frac{29-3}{2}=13 \\ a_3= \frac{13-3}{2} =5 \\ a_2= \frac{5-3}{2} =1 \\ a_1= \frac{1-3}{2}=-1 [/tex]
Answer: -1
larlialaurier

Answer:

5

Step-by-step explanation:

(see attached)

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