Adriana currently runs a total of 18 miles each week. She plants to increase the number of miles she runs each week by 1.5 miles until she is running a total of 38 miles each week. Which equation can be used to determine m, the number of weeks that it will take Adriana to reach her goal?
1. 18 + 1.5m=38
2. (18+1.5)m=38
3. 18(1.5 + m)=38
4. 18 + 1.5 + m=38