Which equation matches the given calculator-generated graph and description? Decide without using your calculator.
Parabola; opens left
A. y = -x2
B. y = x2
C. x = -y2
D. x = y2
Answer: C
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A. No B. Yes
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A. 15,763,255 J B. 1,313,605 J C. 5,254,418 J D. 164,201 J
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A. relatively prime B. 24 C. 4 D. 6
Determine whether the matrix is in row-echelon form. If it is, then determine also whether it is in reduced row-echelon form.
A. Yes; yes B. Yes; no C. No