consider the arithmetic series: 1 + 9 + 17 + 25 +
write a formula for the sum of the first n terms in this series.
a) 4n^2 - 3n
b) 6n^2 - 7n
c) 8n^2 - 5n
d) 10n^2 - n

Randy and trey take turns cleaning offices on the weekends. it takes randy at most 4 hours to clean the offices. it takes trey at most 6 hours to clean the offices. what is the greatest amount of time it would take them to clean the offices together? 2.4 hours 2.5 hours