Apply row operations to the augmented matrix to find the solution to the linear system.
A. x = 9, y = 4, z = 1
B. x = 9, y = 1, z = 4
C. x = 18, y = -9, z = 4
D. x = -9, y = 4, z = 18
Answer: A
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Solve.
+ 
= - 
A. 27 B. -27 C. -28 D. empty set solution
Find the x-intercept and the y-intercept of the graph of the equation. Do not graph the equation.x + y = 4
A. x-intercept = 0; y-intercept = 4 B. x-intercept = 4; y-intercept = 4 C. x-intercept = 2; y-intercept = 2 D. x-intercept = 4; no y-intercept
Find the sum and simplify the answer. 
A. 
B. 
C. 
D. 
Solve.A mathematical model for the average of a group of people learning to type is given by 
where N(t) is the number of words per minute typed after t hours of instruction and practice 
per day, 5 days per week). What is the rate of learning after 50 hours of instruction and practice?
A. 0.15 words per minute typed per hour of instruction and practice B. 0.5 words per minute typed per hour of instruction and practice C. 0.12 words per minute typed per hour of instruction and practice D. 0.1 words per minute typed per hour of instruction and practice