Answer:
25+10n
Step-by-step explanation:
The solution will be
25+10n which n is the number of hour added
and 25 is the base fee
so trial and error
25+10(1) = 35
25+10(2) = 45
25+10(3) =55
the sequence will be
35, 45, 55, 65, 75 and so on.
you can replace the n into x if you want