1, 4, 7, 10, 13 write an explicit and recursive formula for the sequence

Raymond just got done jumping at super bounce trampoline center. the total cost of his session was $43.25 . he had to pay a $7 entrance fee and $1.25 for every minute he was on the trampoline. write an equation to determine the number of minutes (t) that raymond was on the trampoline.

Extra points! find the missing dimension! need asap

Which of the following is an example of a rational number? a. π b. √ 9 c. √ 8 d. 3.8362319