# What is the equation for a billing process that has a one-time fee of $100 and a monthly charge of$25?

For the time in months $t = 0$, the value of the bill equals $100. After $1$month, the amount charged increases in $25, to $125. Lets put it on a $m o n t h \to b i l l$table: $0 \to 100$$1 \to 100 + 25$$2 \to 100 + 25 + 25 = 100 + 2 \cdot 25$$3 \to 100 + 25 + 25 + 25 = 100 + 3 \cdot 25$$\ldots$$m \to 100 + 25 \cdot m$The bill after $m$months is given by the equation $B \left(m\right) = 100 + 25. m\$//