Use a ruler. I can't see the picture.
Answer:
222
Step-by-step explanation:
Let me know if it is correct!
Answer:
72 books will fit on the shelf
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.