Which expression is equivalent to 6 (a minus 3)?

Plz which expression is equivalent to the expression below?

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.

In the diagram of circle o, what is the measure of zabc?