Given arithnetric sequence a+13+b+27+show that a=6 and b=20

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.

If the value of cos330°is√3/2 then find cos 165°.

What is the interquartile range of this day at set?