The augmented matrix is in row-echelon form and represents a system of linear equations. Solve the system using backward substitution.
Write the solution as an ordered triple, if possible.
A. (20 + 11z, -16 - 4z, z) 
B. No solution
C. (20 + 11z, -8 - 4z, z) 
D. (20 + 12z, -16 - 4z, z) 
Answer: C
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Write as an addition problem and find the sum.Susan lost 9 pounds the first week, gained 6 pounds the second week, and lost 7 pounds the third week. What was her net gain or loss?
A. 9 + (-6) + 7 = -22 pounds B. 9 + (-6) + 7 = 22 pounds C. -9 + 6 + (-7) = 10 pounds D. -9 + 6 + (-7) = -10 pounds
Indicate whether the statement is true always, sometimes, or never.A real number is a complex number.
A. Never B. Sometimes C. Always
Determine whether the equation has a graph that is symmetric with respect to the y-axis, the x-axis, the origin, or none of these.x2 - y2 = 4
A. x-axis, y-axis B. origin only C. y-axis, origin D. x-axis, y-axis, origin
Solve the problem.Jay drove 296 kilometers at the average rate of 74 kilometers per hour. How long did the trip take?
A. 3 hr
B. 5 hr
C. 
hr
D. 4 hr