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. ?

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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