Translate the English sentence into an equation using the variables indicated.Raoul and Jeremy both had summer jobs. At the end of the season they had worked a combined total of 755 hours. Use r for the number of hours Raoul worked and j for the number of hours that Jeremy worked.
A. j = r - 755
B. r - j = 755
C. j = 755r
D. r + j = 755
Answer: D
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Solve the system using matrices. 6x - y + 9z = 219x + 7z = 342y+ z = 13
A. No solution B. (-3, 6, 6) C. (3, 1, 6) D. (3, 6, 1)
In your own words, define 
for any nonzero number d.
What will be an ideal response?
Solve.The polynomial 
models natural gas consumption in billions of cubic feet for a certain country during year x, where 
corresponds to 1990, 
to 1991, and so on. Approximately how much gas will be consumed in 2024?
A. 330.8 billion ft3 B. 256.8 billion ft3 C. 46.4 billion ft3 D. 120.4 billion ft3
Pivot once about the circled element in the simplex tableau, and read the solution from the result. 
A. x3 = 5, x2 = -7, z = 10; x1, s1, s2 = 0 B. x3 = 10, x2 = 10, z = 7; x1, s1, s2 = 0 C. x3 = 10, x2 = 7, z = 10; x1, s1, s2 = 0 D. x3 = 5, x2 = -7, z = -10; x1, s1, s2 = 0