A tree casts a shadow of 30m. At the same time, a 40 m pole casts a shadow of 60m. Find the height of tree?

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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.