Which expression is equivalent to 2/3(6x+3)

What is the distance between the points 4,10 and -3,-14 on the coordinate plane

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 center and the radius of the circle with the equation: x^2-2x+y^2+4y+1=0?