Question

What is s10 for 1 + 3 + 9 + 27?

Answer 1

use a calculator

Answer 2

it is a geometric sequence, what number does each previous number get multiplied by to get the next number?

Answer 3

3.

Answer 4

So you keep multiplying by 3 until you get to your 10th term.

Answer 5

the formula is s10 = a1(r)^n-1

r is 3
a1 is the 1st term

s10 = 1(3)^9

Answer 6

what do you get?

Answer 7

19,683 ?

Answer 8

yup

Answer 9

Thank you. :)

Answer 10

yw