What is the range of the relation?

{ (1, 2), (2, 4), (3, 2), (4, 6) }

A. { 1, 2, 3, 4)

B. { 1, 2, 3, 4, 6}

C. { 2, 4, 6 }

D. D. {2, 4}

What is the answer of 13/4*5/8?

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Determine whether each relation is a function. Explain. y=1/2x-6