In a particular class, there are 3 freshmen, 5 sophomores, 11 juniors, and 2 seniors. if the instructor randomly chooses a student to answer a question in class, what is the probability that the student chosen will be a freshman?

Idon’t understand this.. will someone ? will mark brainliest along with 20 points.

What is the distance between the points (2 -3) and (-6 4) on the coordinate plane

Expresa commuter train leaves downtown sation and travels at a average speed of 55 miles per hour towards the north side sation, which is 50miles away. thirty minutes later, express commuter train #7 leaves north side and travels at a average speed of 35miles per hour towards downtown sation. at the moment the two trains pass each other, how far(in miles) is train #12 from the downtown sation and how long(in minutes) has the #12 train been traveling