Diana received 65 points on a project for school. She can make changes and receive three-tenths of the missing points back. She can do this 10 times . Create the formula for the sum of this geometric series, and explain your steps in solving for the maximum grade Diana can receive.

Question

rocklionmba · Answer

@dumbcow @aaronq

dumbcow · Answer

$$35(\frac{3}{10} + \frac{3}{10}^2 +...\frac{3}{10}^{10})$$

rocklionmba · Answer

this is diverging... am I right?

dumbcow · Answer

no converging because 3/10 raised to big number goes to zero

dumbcow · Answer

formula for sum:
$$\frac{1-r^n}{1-r}$$
in this case r = 3/10

rocklionmba · Answer

and then n would be 10 right?

dumbcow · Answer

yes

rocklionmba · Answer

(btw I leave and come back of a glitch in openstudy that does that) so then we first have to the r^n

rocklionmba · Answer

hoe do we get that? im bad with fractions

dumbcow · Answer

use a calculator .... (3/10)^10

rocklionmba · Answer

0.0000059049

rocklionmba · Answer

I think I got it from here. thanks

dumbcow · Answer

ok :)