# Beth's monthly charge for Internet access c is represented by the function c=12+2.50h, where h represents the number of hours of usage during a month. What is the total charge for a month in which Beth used the Internet for 9 hours?

Total charge for a month is $34.50$
c= 12+ 2.50h ; h=9.0 :.c = 12+2.50*9= 34.50# unit
Total charge for a month is $34.50$ unit for using internet for $9.0$ hrs . [Ans]