1 ) Billy walks 15 miles every day to soccer practice and he had 5 practices last week.
We know that, 1 mile = 1760 yards
So, 15 miles = (15× 1760) yards = 26400 yards
Thus the total distance walked in 5 practices will be:
2) Mark's current age is years
So, his age was in 10 years ago
Given that, his current age is 3 times his age 10 years ago.
So, the equation to represent this situation will be :