If u know the diameter of a circle, how do you find it’s circumference?

Look at the following graph of the given equation. determine whether the equation is a function. explain why or why not.

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.

Find the area of the triangle shown 3 by 6