How many seven-digit phone numbers are available in area code 825 if no phone number can begin with 0 and 1?
?
A. 100,000
B. 8,000,000
C. 5,000,000
Answer: B
Mathematics
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Multiply.(x + y - 4)(x + y + 4)
A. x2 + 8xy + y2 - 16 B. x2 + y2 - 16 C. x2 + 2xy + y2 + 8x + 8y - 16 D. x2 + 2xy + y2 - 16
Mathematics
Solve for the specified variable.S = 
for r
A. r = 
- 1
B. r = S - a
C. r = 
D. r = 
Mathematics
6
A. 
B. 
C. 
D. 
Mathematics
Determine if the equation is an identity.
+ 
= sin 5x csc x sec x
A. Identity B. Not an identity
Mathematics