Solve the system of equations.
A. x = 2, y = -1, z =-9
B. x = -2, y = -1, z = -9
C. x = -2, y = -1, z = 9
D. x = 2, y = -1, z = 9
Answer: C
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A. 
B. 
C. 
D. 
Solve.A number less 7 is -19. Find the number.
A. 12 B. 26 C. -12 D. -26
Write an algebraic equation and use it to solve the problem.Sergio's internet provider charges its customers $8 per month plus 5¢ per minute of on-line usage. Sergio received a bill from the provider covering a 
period and was charged a total of $59.50. How many minutes did he spend on-line during that period? (Round to the nearest whole minute, if necessary.)
A. 367 minutes B. 247 minutes C. 870 minutes D. 87 minutes
According to Lambert's law of absorption, the percentage of incident light L, absorbed in passing through a thin layer of material x, is proportional to the thickness of the material. If 
in. of a certain material reduces the light to half of its intensity, how much additional material is needed to reduce the intensity to one-fourth of its initial value?
What will be an ideal response?