The answer is D hope this helps :]
Interest from first account is :

Interest form second account is :

So, total interest is :

Therefore, total interest is $77.877 .
I think it's a rectangle block because the surface is flat on all the sides.
Answer:
GCF=2
Step-by-step explanation:
28-1,2,4,5,14
42-1,2,3,6,7
56-1,2,7,8,28
Division , timetable , adding , and subtracting