Does anybody know the answer to this?

I think the answer is D.

Hope this helps.

1) c 2143.6 cm

2) c 113.0 m

3) a 33.5 ft

4)   d 2 cm

5) c 20 mm

6) 180 in

7) d 120 ft

yes because there is exactly one y value for every x value

for function there can't be more than one value for every x value