Factor the difference of two squares. 81s2 - 49
a. ( 81s + 7 ) (81s - 7 )
b. ( 81s + 49 ) ( 81s - 49 )
c. ( 9s - 7 )2
d. ( 9s - 7 ) 2
e. ( 9s + 7 ) (9s -7 )
e. ( 9s + 7 ) (9s -7 )
Mathematics
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Perform the indicated operation. Simplify, if possible.
+ 
A. 
B. 
C. 
D. 
Mathematics
Give the probability distribution and sketch the histogram.The telephone company kept track of the calls for the correct time during a 24-hour period for two weeks. The results are shown in the table.
A. 
B. 
C. 
D. 
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Write the expression using a single radical sign. Assume that all variables represent positive real numbers. Simplify the radicand if possible.
A. 3
B. 
C. 9 
D. 3 
Mathematics
Add or subtract. Simplify if possible.
- 
A. 
B. 
C. 
D. 
Mathematics