Fiona, Richard & Pip share some money in the ratio 3: 5:1.
In total, Fiona and Pip receive £12.
How much does Richard get?

answer is x<

total of apples - take away four

6-4 = 2

answer is 2 apples

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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.