Written in scientific notation which is the best estimate of how many feet the jet will travel

Will give brainliest series to sigma notation write the following series in sigma notation. 6+10+14+18+22+26+30 example image shown below.

The standard deviation for a set of data is 5.5. the mean is 265. what is the margin of error?

Diane’s bank is offering 5% interest, compounded monthly. if diane invests $10,500 and wants $20,000 when she withdrawals, how long should she keep her money in for? round to the nearest tenth of a year.