The augmented matrix is in row-echelon form and represents a system of linear equations. Solve the system using back-substitution.
A. ?
B. {(8, -1)}
C. {(4, 8)}
D. {(-1, 8)}
Answer: A
Mathematics
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Use polar coordinates to find the limit of the function as (x, y) approaches (0, 0).f(x, y) = cos
A. 1
B. 
C. 0
D. No limit
Mathematics
Solve the problem.What is the domain of the sine function?
A. all real numbers, except integral multiples of ? (180°)
B. all real numbers
C. all real numbers from -1 to 1, inclusive
D. all real numbers, except odd multiples of 
(90°)
Mathematics
Graph using the intercept method.5x + 4y = 20
A. 
B. 
C. 
D. 
Mathematics
Solve the equation. Check your solution.-7.2x = 21.6
A. {-30} B. {3} C. {-0.3} D. {-3}
Mathematics