Question

Find the sum of a 10-term geometric sequence when the first term is 3 and the last term is 59,049 and select the correct answer below.
answer choices:
177,147
88,572
88,575
177,144

Answer 1

an=a1⋅rn−1

Answer 2

an=3⋅rn−1

Answer 3

a10=3⋅r9

Answer 4

59049=3⋅r9

Answer 5

59049/3=r9

Answer 6

19683=r9

Answer 7

r=3

Answer 8

S10=3(1−310)1−3=88572

Answer 9

can you help me with another?

Answer 10

sure

Answer 11

Evaluate S5 for 400 + 200 + 100 + … and select the correct answer below.
answer choices:
25
775
1,125
500

Answer 12

so the rate is 1/2 every time

Answer 13

and that is s sub 5 or 2_5

Answer 14

so the last two numbers are 50 and 25

Answer 15

so 400 + 200 + 100 + 50+25

Answer 16

775

Answer 17

thanks

Answer 18

yea np