Factor by grouping. Assume any variable exponents represent whole numbers.ab - 9c - ac + 9b
A. (b + c)(a + 9)
B. (b - c)(a - 9)
C. (b + c)(a - 9)
D. (b - c)(a + 9)
Answer: D
Mathematics
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Use the Gauss-Jordan method to find A-1, if it exists.A = 
A. 
B. 
C. 
D. 
Mathematics
Simplify the expression. Assume that all variables are positive when they appear.
A. 
B. 
C. 
D. 
Mathematics
Explain how the graph of f can be obtained from the graph of y = 
or y = 
. f(x) = 
A. Shift the graph of y = 
to the right 3 units.
B. Stretch the graph of y = 
vertically by a factor of 3.
C. Shift the graph of y = 
to the left 3 units.
D. Stretch the graph of y = 
vertically by a factor of 3 and reflect across the x-axis or the y-axis.
Mathematics
Multiply and simplify.
? 
A. 
B. 
C. - 
D. - 
Mathematics