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How to write 3 tenths and 5 tenths as a decimal

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.

Using elimination, what is -4x+2y=-12 4x+8y=-24