Trey runs 2.1 miles, five days a week. How many miles does he run in 2 weeks?
In a week, Trey runs 2.1 miles/day x 5 days/week = <<2.1*5=10.5>>10.5 miles.
Therefore, Trey runs 10.5 miles/week x 2 weeks = <<10.5*2=21>>21 miles in 2 weeks. Answer: \boxed{21}.
To find out how many miles Trey runs in 2 weeks, we'll start by calculating how many miles he runs per week.
Trey runs 2.1 miles, five days a week, so he runs a total of 2.1 * 5 = 10.5 miles per week.
Now, to find out how many miles he runs in 2 weeks, we need to multiply the weekly distance by 2:
10.5 miles/week * 2 weeks = 21 miles.
Therefore, Trey runs 21 miles in 2 weeks.
To find out how many miles Trey runs in 2 weeks, we first need to calculate the number of miles he runs in 1 week.
Trey runs 2.1 miles per day, five days a week. So, in one week, he runs 2.1 miles * 5 days, which equals 10.5 miles per week.
Now, to find out how many miles he runs in 2 weeks, we multiply his weekly mileage by 2:
10.5 miles/week * 2 weeks = 21 miles.
Therefore, Trey runs a total of 21 miles in 2 weeks.