Guided Practice Which property justifies the first step in solving this equation ?+9=11+9−9=11−9

A.
Substitution Property of Equality

B.
Addition Property of Equality

C.
Subtraction Property of Equality

What is the value of r of the geometric series?

1/2+1/6-3/4 simplify the given expression leaving the answer in improper fraction form.

1. according to the internal revenue service, the mean tax refund for the year 2007 was $2,708. assume the standard deviation is $650 and that the amounts refunded follow a normal probability distribution. a. what percent of the refunds are more than $3,000? b. what percent of the refunds are more than $3,000 but less than $4,000? c. what percent of the refunds are less than $2,000?