Simplify the expression.
?
?
A. 
B. ?
C. ?
D. ?
Answer: B
Mathematics
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Find the number of subsets of the set.{1, 2, 3, ..., 9}
A. 1024 B. 508 C. 512 D. 16
Mathematics
Perform the indicated operation and simplify.
+ 
A. 
B. 
C. 
D. 
Mathematics
Solve.The electric current I in a circuit varies directly as the voltage V. When 30 V are applied, the current is 3 A. What is the current when 27 volts are applied? Round your answer to the nearest hundredth, if necessary.
A. 2.7 A B. 10 A C. 60 A D. 4.25 A
Mathematics
Solve the equation.
a - 
= -3
A. -5 B. 7 C. 5 D. -7
Mathematics