1/2 a bunch because 8 divided by 4 = 1/2 :)
B. All rectangles are parallelograms! And C. All equilateral triangles are isosceles! :-)
Answer: 
Step-by-step explanation:
Given
New mail carrier takes 4 hours for delivery i.e.
New mail carrier completes
part of work in 1 hour
Old mail carrier takes 3 hours for delivery i.e.
mail carrier completes
part of work in 1 hour
If they work together, they complete the work in x hours i.e.

Yes, as long as it's between the two numbers
51) -4 and 1
52) -1 and -3
53) -9 and -10