3times 9 times 10 to the first power

Aboat costs 19200 and decreases in value by 12% per year. how much will it cost in 5 years

Anyone? 15m is what percent of 60m; 3m; 30m; 1.5 km?

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.