I am having trouble figuring the appropriate expression for this problem ... i have to determine what "t" = if the following ... 7 and 35 ... 6 and 40 ... and 9 and 45 .... The 6 and 40 are throwing me off .. only connection i can come up with is that the answers go down by 5 (45, 40 and 35 .. suggesting maybe the answer would be 30) BUT .. i think that must be wrong ... any suggestions would be helpful ... thank you!