Use matrices to solve the system of equations (if possible). Use Gaussian elimination with back-substitution or Gauss-Jordan elimination.
A) x = –4, y = –2, z = 5
B) x = –2, y = 4, z = –5
C) no solution
D) x = –4, y = 2, z = 5
E) x = 4, y = 2, z = 5
A) x = –4, y = –2, z = 5
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Use the decibel scale to answer the question.How does the intensity of sound form a concert speaker at a distance of 1 meter compare to the intensity at a distance of 900 meters?
A. Factor of 2700 weaker at 900 m. B. Factor of 10900 weaker at 900 m. C. Factor of 900 weaker at 900 m. D. Factor of 810,000 weaker at 900 m.
Solve the problem.Find the number of units that must be produced and sold in order to yield the maximum profit, given the following equations for revenue and cost:R
= 2xC
= 0.01x2 + 1.3x + 10.
A. 70 units B. 330 units C. 165 units D. 35 units
Convert the units.89 m2 = 
cm2
A. 89 B. 890,000 C. 890 D. 0.89
The line graph shows the recorded hourly temperatures in degrees Fahrenheit at an airport.
Estimate the temperature at 9:45 a.m.
A. -1°F B. 11°F C. -11°F D. 1°F