Answer:
Equation: m: number of miles she still has to run; m+6+8+6=28
Solution: m=8
Step-by-step explanation:
Sum of miles she has to run total = 28
Monday: ran 6 miles
Tuesday: ran 8 miles
Wednesday ran: 6 miles
Sum of miles ran: 20
Since you're trying to figure out how many miles she has left, subtract 20 from 28:
28-20=8
She has 8 miles left to run
The equation is: 6+8+6+m=28; m=number of miles left
