# Math Help - finite geometric sequence

1. ## finite geometric sequence

ok i need some help guys. if anyone is good with a graphing calculator then please help me out.

the directions are to ........(use a graphing utility to find the sum of the finite geometric sequence.) the problem is i dont know how to use my graphing calculator.

10
∑ 10(3/5)^(i-1)
i=1

anyone have a clue? if so can you please teach me?

2. Originally Posted by flexus
ok i need some help guys. if anyone is good with a graphing calculator then please help me out.

the directions are to ........(use a graphing utility to find the sum of the finite geometric sequence.) the problem is i dont know how to use my graphing calculator.

10
∑ 10(3/5)^(i-1)
i=1

anyone have a clue? if so can you please teach me?
$\sum_{i=1}^{10} 10\left(\frac{3}{5}\right)^{i-1} =
$

$10 \sum_{i=1}^{10} \left(\frac{3}{5}\right)^{i-1}$

3. Originally Posted by skeeter
$\sum_{i=1}^{10} 10\left(\frac{3}{5}\right)^{i-1} =
$

$10 \sum_{i=1}^{10} \left(\frac{3}{5}\right)^{i-1}$

thank you thank you thank you. you just save helped me on about 7 other problems by showing me that.

4. Originally Posted by skeeter
$\sum_{i=1}^{10} 10\left(\frac{3}{5}\right)^{i-1} =
$

$10 \sum_{i=1}^{10} \left(\frac{3}{5}\right)^{i-1}$
i just wanted to ask did you remember how to do that or is there a manual somewhere i can buy to learn to do that?