Answer:
3m + 7 = 30.4
m = 7.8
Step-by-step explanation:
3m, where m is the average number of miles per day, will represent how many miles she rides in the next 3 days.
She has already ridden 7 miles, so 7 has to be added to 3m in the equation.
Then, the equation has to be set equal to 30.4, because that is her goal for the week
Put this all together:
3m + 7 = 30.4
Solve for m:
3m + 7 = 30.4
3m = 23.4
m = 7.8
So, Abigail has to ride an average of 7.8 miles per day to meet her goal.