Acomputer repairman charges an initial fee of $100 plus an hourly fee of $75. mr. billings paid the repairman $475. how many hours did the repairman work?

Asmall foreign car gete 42 miles per gallon and user 35 gallons on a trip.gasoline costs $1.05 per gallon.what was the cost of gasoline per mile driver?

Prove that the sum of two consecutive exponents of the number 5 is divisible by 30.if two consecutive exponents are 5n and 5n + 1, then their sum can be written as 30.

Which table shows a proportional relationship between miles traveled and gas used?