Show work and explain with formulas.

picture attached:

14. evaluate

15. find the sum:

16. express using sigma notation: 1 + 4 + 7 + 10 + 13

The system of equations graphed below has how many solutions? y = 2x + 2

Given the following sampling distribution of one mean with a sample size 49, from a normally distributed population,find the population standard deviation, o.79828588912497

George has seven boxes of five pencils. giulio three boxes of eight pencils. one of the boys arranges all his pencils equally into two groups. was this george or giulio how many are in each group explain