Answer:
the answer is a 
Step-by-step explanation:
i took the test on gogo.net
 
        
             
        
        
        
The answer is 81. since (-3)^2 is 9. Therefore, 9x9=81.
        
             
        
        
        
Answer:
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Answer:
723 students participated in the event
Explanations:
The total number of students in Hanley's school = 1000
0.723 of the students participated in an event
Number of students that participated in the event = 0.723 x 1000
Number of students that participated in the event = 723