Answer:
square
Step-by-step explanation:
all sides have the same length 
all vertices form 90 degree angles
In order to subtract fractions, you need the denominators (bottom number) to be the same.

.
Answer:
198 km
Step-by-step explanation:
81/9=9
9*22=198
Question is basically asking you do break down 66 to it's factors
11 x 6=66
11 is a prime number it can't be broken down
6 can be broken down to 3 x 2
therefore our answer is:
3 x 2 x 11
there are 12 square numbers between 1,000 and 2,000.
starts off at 32 bc 32^2=1024
ends at 44 bc 44^2=1936