Simplify.
A. 
B. 1
C. 
D. -1
Answer: D
Mathematics
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Use the rules for exponents to rewrite the expression and then evaluate the new expression. 
A. 0 B. -12 C. 1 D. -4
Mathematics
The matrix is the final matrix form for a system of two linear equations in variables x1 and x2. Write the Solution of the system.
A. x1 = 3 x2 = 5 B. x1 = -5 x2 = -3 C. x1 = 5 x2 = t for any real number t D. x1 = 5 x2 = 3
Mathematics
Simplify.(
+ 4)(
- 4)
A. 22
B. 2
C. 6 - 2
D. -10
Mathematics
Find the exact value of the composition.cot-1 
A. 
B. - 
C. 
D. - 
Mathematics