-625
use long multiplication to evaluate .
First, we need to solve for the common ratio from the data given by using the equation.
a(n) = a(1) r^(n-1)
15 = -3 r^(2-1)
-5 = r
r = -5
Then, we can find the sum by the expression:
S(n) = a(1) ( 1 - r^n) / 1-r
S(8) = -3 (1 + 5^8) / 1+5
S(8) = -195313
Bro I’m so tired of those people answering with links
Answer:
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Step-by-step explanation:
1 minute 8.25 seconds per mile
