Respuesta :

Abu99

Answer:

635/64

Step-by-step explanation:

General formula of geometric sequence:

[tex]u_{n} = ar^{n - 1} [/tex]

Un = nth term

a = first term

If we plug in the what we are given into the general formula for the 7th term, we can solve for the first term:

[tex]u_{7} \: (or \: s_{7}) = a(2)^{7 - 1} = 635 \\ \\ a(2)^{6} = 635 \\ \\ 64a = 635 \\ \\ a = \frac{635}{64} [/tex]

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