I'm not sure which numbers you are referring to, but 3 has the same absolute value as -3, and 7 has the same absolute value as -7, just for an example.
You can do 1-1/6 (1 represents the whole class)
6/6-1/6
=5/6
Monomials are the expressions with one terms.
A.) 
Since, it has only one term. Therefore, it is a monomial.
B.) 
Since, it has two terms. Therefore, it is not a monomial.
C.) 
Since, it has only one term. Therefore, it is a monomial.
D.) 
Since, it has only one term. Therefore, it is a monomial.
E.) 
Since, it has only one term. Therefore, it is a monomial.
F.) 
Since, the variable is in the power. So it is not a monomial.
G.) 
Since, the power is not a integer. Therefore, it is not a monomial.
Answer:
15 inches
Step-by-step explanation:
We have that,
Length of the photo = 4 inches and Width of the photo = 6 inches
Also, the width of the image on the calendar = 10 inches
Let, the length on the image of the calendar = x inches.
Since, the ratio of the photo and its image will remain same, we get,

i.e. 
i.e. x = 15
Hence, the length of the image of the photo on the calendar is 15 inches.