Originally Posted by

**oryxncrake** Ok, I have more of a technical issue here since I know how to calculate the sum of geometric series.

The question asked is: Find the sum of the following series: 3 + 3square root of 9 + 9... S7.

My question is, how is "3square root 9" entered into a calculator? Note that the "3" is not a cubed root... it is just on the left-hand side of the square root sign. I know that it has to equal 5.196... since r = the square root of 3 (the question provides this), but I just can't figure out how to enter this into my graphing calculator.

Thanks.