Easy 6th grade math!picture here

c and d

Step-by-step explanation: The variables are all of the letters

The variable terms are 2c, 15cd, and 9d

Step-by-step explanation: terms are separated by the signs. If it is looking for variable terms, then you want to put the ones with variables that are separated by the signs

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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.