Which set of values is a function?
1:(6,-5)(7,-3)(8,-1)(9,1) 2:(9,5)(10,5)(9,-5)(10,-5) 3:(3,4)(4,-3)(7,4)(3,8)
4:(2,-2)(5,9)(5,-7)(1,4)

1.

Step-by-step explanation:

For a function, you want each x-value to have one unique output, 1 passes that because we don't see any repeating x-values. 2 isn't a function because the point (9,5) and (9,-5) don't .work. If you plotted those points, that wouldn't pass the vertical line test. 3. has the same problem (3,4) and (3,8) and 4 with (5,9) and (5,-7).

I hope that helps?

:)

the answer is 844

step-by-step explanation:

it is 844 because if you add 836.50 + 7.5 you will get 844