Answer:
![x \leq 0.25a-0.75](https://img.qammunity.org/2020/formulas/sat/middle-school/w26e0e1f73150nc9usithsqelhef58nl60.png)
Step-by-step explanation:
Let
x -----> the number of miles
we know that
The total miles multiplied by $4 per mile plus the flat fee of $3 must be less than or equal to a
so
The inequality that represent this situation is
![4x+3 \leq a](https://img.qammunity.org/2020/formulas/sat/middle-school/7kqeosork8xq1sicgljjqqww32v61uh0lw.png)
Solve for x
Subtract 3 both sides
![4x \leq a-3](https://img.qammunity.org/2020/formulas/sat/middle-school/d4x5tzyht9e5933ab5mp2o5y75h654oip4.png)
Divide by 4 both sides
![x \leq 0.25a-0.75](https://img.qammunity.org/2020/formulas/sat/middle-school/w26e0e1f73150nc9usithsqelhef58nl60.png)