Which relation is a function?

a.
{(1, 2); (2, 3); (3, 4); (2, 5)}

b.
{(1, 2); (2, 3); (3, 4); (4, 5)}

c.
{(1, 2); (1, 3); (1, 4); (1, 5)}

d.
{(1, 2); (3, 2); (3, 3); (4, 2)}

Will give brainliest what is the value of x? enter your answer in the box.

In dire need~! describe how to use area models to find the quotient 2/3 divided by 1/5. check your work by also finding the quotient 2/3 divided by 1/5 using numerical operations only.

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