Question

evaluate each finite series for the specified number of terms.
80-40+20-.....;n=8

Answer 1

@whpalmer4 @eliassaab

Answer 2

can you help me??? @eliassaab

Answer 3

\[
80-40+20-10+5-\frac{5}{2}+\frac{5}{4}-\frac{5}{8}=\frac{425}{8}
\]

Answer 4

thank you but how did you get that

Answer 5

each term is -the term before it divided by 2

Answer 6

oh i see thats cool thank you

Answer 7

\[
a_1=80\\
a_n =- \frac {a_{n-1}}2
\]

Answer 8

thank you so much

Answer 9

You list them and you do the arithmetic

Answer 10

YW