Simplify the expression.x(x7)
A. x8
B. 2x8
C. 2x7
D. x7
Answer: A
Mathematics
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Solve the system of equations by Gauss-Jordan elimination.
A. 
B. 
C. 
D. ?
Mathematics
Determine the amplitude and range of the function and sketch its graph.y = -3 cos 
x
A. amplitude: 3; range: [-3, 3]
B. amplitude: 3; range: [0, 3] 
C. amplitude: 
; range: (-?, ?)
D. amplitude: 3; range: [-3, 3]
Mathematics
Solve the problem.List all the permutations of the letters in the word "CATS" taken two at a time.
What will be an ideal response?
Mathematics
Find the vertex, focus, and directrix of the parabola. Graph the equation.y2 = 16x
A. vertex: (0, 0)
focus: (0, 4)
directrix: y = -4
B. vertex: (0, 0)
focus: (4, 0)
directrix: x = -4
C. vertex: (0, 0)
focus: (-4, 0)
directrix: x = 4
D. vertex: (0, 0)
focus: (0, 4)
directrix: y = -4
Mathematics