Which relation is a function?

{(6, 0), (–7, 14), (–2, –5), (–2, 5)}

{(–1, 3), (5, 3), (–6, 7), (9, 0)}

{(0, –7), (4, –8), (0, –9), (4, –10)}

{(2, 4), (2, –7), (2, 11), (2, –15)}

Atemperature of 1.64◦f corresponds to answer in units of ◦c.

If t17 = 3 (t5) in an arithmetic progression, find t1 in terms of d.

20.ju inces. which ordered pair is a viable solution if x represents the number of books he orders and y represents the total weight of the books, in ounces? (-3,-18) (-0.5, -3) (0,0) (0.5, 3)