Which function has an inverse that is also a function?
{(-1, -2), (0, 4), (1,3), (5, 14), (7,4)}
{(-1,2), (0,4), (1,5), (5, 4), (7, 2)}
{(-1,3), (0.4), (1, 14), (5, 6), (7, 2)}
{(-1,4), (0.4), (1, 2), (5,3), (7, 1)}

its c or d   take a lucky guess my dude

to determine the unit cost your would divide the total cost by the number sold.

7 bagels for $4.41       $4.41/7 = $.63 each at fresh side

5 bagels for $3.60         $3.60/5 = $.72 each at value mart

b, i believe, but not sure.

the answer is c: divide the arc's degree measure by 360°, then multiply by the circumference of the circle.