Verify that the matrix is invertible and find its inverse.A = 
A.
A-1 = 
B.
A-1 = 
C.
A-1 = 
D. A-1 does not exist.
Answer: B
Mathematics
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Solve the problem.Find two positive numbers whose sum is 129 and whose product is 24. Let x represent one of the numbers and y represent the other. Which one of the following nonlinear systems would lead to the solution?
A. 
B. 
C. 
D. 
Mathematics
The graph of a piecewise-defined function is given. Write a definition for the function.
A. f(x) = 
B. f(x) = 
C. f(x) = 
D. f(x) = 
Mathematics
Find the limit, if it exists.
A. 
B. 
C. 20x
D. Does not exist
Mathematics
Solve. Graph the solution on a number line, and express it in interval notation.3x < 6
or
x + 2 ? 11
A. x > 2, (2, ?)
B. x ? 9, (-?, 9]
C. x ? -9 or x > 2, (-?, -9] ? (2, ?)
D. x < 2 or x ? 9, (-?, 2) ? [9, ?)
Mathematics