What question are you needed answers to?
Answer:
C
Step-by-step explanation:
A and B are not straight lines, so they are not linear functions.
C and D are straight lines, so they are linear. However, D fails the vertical line test, so it is not a function.
The answer is 439.
3+(1/(7+1/15) = 333/106
333+ 106 = 439.