Question

urgent HELP!

Answer 1

evaluate each finite series for the specifiednumber of terms
80-40+20-...,n=8

Answer 2

use the formula

S = a*(1-r^n)/(1-r)

where in this case

a = 80
r = -0.5
n = 8

Answer 3

oh ok! can u help with two more

Answer 4

determine whether each infinite geometric series converges or diverges. if converges stat the sum
150+30+6+...
-10-20-40-...

Answer 5

can you identify the value of r for each?

Answer 6

first one is 5

Answer 7

other one is .5

Answer 8

is that correct @jim_thompson5910

Answer 9

150 ---> 30 means you divide by 5

or that you multiply by 1/5 = 0.2

Answer 10

so the first r value is r = 0.2

Answer 11

since |r| <1, we know it converges

Answer 12

oh .. what about the other one

Answer 13

to find the infinite sum, use this formula

S = a/(1-r)

Answer 14

in the first one, a = 150, r = 0.2

Answer 15

Yeah i got that! what about the second one

Answer 16

-10-20-40-...

a = -10
r = 2 (since -20 divided by -10 = 2)

because r > 1, this series diverges

Answer 17

actually because |r| > 1, this series diverges

Answer 18

oh...i think i undersand! thanks so much! have a good night!

Answer 19

you're welcome