Helpppp please . What is the sum of an 8-term geometric series if the first term is 15 and the last term is -4,199,040? -3,599,175 -3,359,230 -3,119,285 -2,879,340
15*r^7=-4199040 solve for r then...
a-a*r+a*r^2-a*r^3+a*r^4-a*r^5+a*r^6-a*r^7 use that with a is 15 and r is -6
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