Convert the units using unit fractions.28 lb = 
oz
A. 280
B. 
C. 392
D. 448
Answer: D
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Solve the problem.Determine whether (-2, 6, -1) is a solution of the system -x + 3y + 4z = 16 3x + 2y - z = 7 4x - y + 3z = -17.
A. No B. Yes
Solve the problem.For a culture of 30,000 bacteria of a certain strain, the number of bacteria N that will survive x hours is modeled by the formula N = 3000
. After how many hours will 27,000 bacteria survive?
A. 73 hr B. 19 hr C. 91 hr D. 81 hr
Solve the problem.One pump can drain a pool in 7 minutes. When a second pump is also used, the pool only takes 3 minutes to drain. How long would it take the second pump to drain the pool if it were the only pump in use?
A. 2
min
B. 
min
C. 5
min
D. 17 min
Write as a percent. Round to the nearest hundredth of a percent when necessary.
A. 10.34 % B. 1.03 % C. 9.67 % D. 96.67 %