If k, m, and t are positive integers and k + m = t , do t and 12 have a common factor 6 4 12 greater than 1 ?

Janet drove 300 miles in 4.5 hours. write an equation to find the rate at which she was traveling

How do i simply this expression (quadratic formula basis) on a ti-84 or normal calculator?

Consider the set of all four-digit positive integers less than 2000 whose digits have a sum of 24. what is the median of this set of integers?