Two planes, which are 2820 miles apart, fly toward each other. Their speeds differ by 55 mph. If they pass each other in 4 hours, what is the speed of each?​

what are you trying to solve here

step-by-step explanation:

sample answer: you can determine whether each element of the domain is paired with exactly one element of the range. for example, if given a graph, you could use the vertical line test; if a vertical line intersects the graph more than once, then the relation that the graph represents is not a function.