PLEASE HELP!! Which inequality represents the phrase "the sum of a number and 3 is at least 15"?
A. x + 3 >15
B. x + 3 <15
C. x + 3 ≥15
D. x + 3 ≤15

10 ! a train starts from grand city and travels toward belleville 388 miles away. at the same time, a train starts from belleville and runs at the rate of 47 miles per hour toward grand city. they pass each other 4 hours later. find the rate of the train from grand city.