Answer:

Step-by-step
explanation
explanation is attached to the picture
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Answer:
An algebraic expression which consists of one non-zero term only is called a monomial. Examples of monomials: a is a monomial in one variable a.
Step-by-step explanation:
Associative property of addition
Answer:
central angle, in radians
Step-by-step explanation:
The ratio s/r is equal to the central angle, which must be in radians.