How many output points does the vertical line test cross in this graph, and is it a function?

The sum of the speeds of two trains is 720.2 mph. if the speed of the first train is 7.8 mph faster than the second train, find the speeds of each.

Find measure angle 1 and measure angle 3 in the kite the diagram is not drawn on the scale

Dots sells a total of 279 t-shirts ($2) and shorts ($4). in april total sales were $670. how many t-shirts and shorts did dots sell?