True or False: Are these expressions linear? If not, why? 1) 3x + 13
2) 8/x - 4x
3) 6x^4 + 3x -9
4) -7x - 5x^0 + 12

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.

The base of a triangle exceeds the height by 9 inches. if the area is 180 square inches, find the length of the base and the height of the triangle.

2. explain in words how you plot the point (4, −2) in a rectangular coordinate system.