Find the domain of the function.f(x) = 
A. {x|x ? 0}
B. {0}
C. {x|x ? 0}
D. all real numbers
Answer: D
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Solve the system by the elimination method. x + 5y = -3 5x + 6y = -15
A. {(-2, -1)} B. {(-3, 0)} C. {(-2, -3)} D. ?
Use the counting principle to obtain the answer.The frequency setting for a garage door opener is determined by the positions of ten switches, each of which can be set to a "+" or "-" position. In how many ways can the switches be set?
A. 100 B. 1144 C. 59,049 D. 1024
Fill in the blank with one of the words or phrases listed below.
A(n) 
contains a whole number part and a fraction part.
A. composite number B. mixed number C. prime factorization D. prime number
Simplify the expression. Assume that all variables are positive when they appear.
A. 5
- 7
B. 6
+ 7
C. 5
- 3
D. 4
- 3