I would go with cylinders cause it's a tube it doesn't any sharp points or angles like the other choices. hope this helps.
Answer:
2 and 1/4
Step-by-step explanation:
-5 1/4 - (-7 1/2)=
Rewrite as
-5.25 + 7.5 =2.25
The answer I got for 4a x 7c (2- plus 4- is 14c -4a
Basically you draw the same thing on the other side of the x-axis but the b would be in the c spot and the c would be in the b spot and so on