John called a plumber to fix a leak in his bathroom. The plumber charged $30 to come to the house and $25 an hour while fixing the leak. If the final bill was $105, how many hours was the plumber at John's house?

3 hours

Step-by-step explanation:

We know that $30 of the $105 bill was just to come to the house, leaving $75 of the bill due to the hours spent.  Since the rate per hour is $25/hour, that means 75/25 = 3 hours were spent at the house

105

Step-by-step explanation:

25 + 25 + 25 + 30 = 105 so the three 25$ are the hours so three hours plus the fee of the plumber going there

i think is g(1)=-1.

hope that i can