Hi there. I'll be answering both questions on in the screenshot as I can make both of them out.
For 18.) The coordinates on a graph are determined by the function "(x,y)", which are values based on the x-axis and y-axis on the graph. The horizontal line, or the one that goes left to right, is the x-axis, while the vertical line, or the one that goes up and down, is the y-axis.
As we can see in the graph, the point lies on the x-value of 5, and meets up with the y-value of 7; therefore, the coordinates for the point are C.) (5,7)
For 19.) The Millers drove 150 miles in 3 hours. To determine how long it takes for them to drive 400 miles, we need to find a scale factor. Simply divide 150 by 3 to get how many miles per hour on average they are going. 150 / 3 = 50; divide 400 by 50 to determine how many hours it takes. 400 / 50 = 8
It took the Millers B.) 8 hours to drive 400 miles.
