Ascientist wants a 45 milliliter saline solution with a concentration of 11%. she has concentrations of 7% and 19%. how much of each solution must she use to get the desired concentration?

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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.