Solve the system by substitution or elimination. If a system is inconsistent or has dependent equations, say so.
A. {(0, 0, 2)}
B. {(0, 2, -2)}
C. {(0, 2, 0)}
D. ?; inconsistent system
Answer: C
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Solve.The population of a certain country is growing at a rate of 1.4% per year. How long will it take for this country's population to double? Use the formula 
which gives the time, t, for a population with growth rate k, to double. (Round to the nearest whole year.)
A. 49 years B. 51 years C. 52 years D. 50 years
Simplify.
A. 4
B. 16
C. 4
D. 4 
Solve the problem.In a distant solar system the diameter of planet A is 7 times as great as the diameter of planet B. The diameter of planet B is 857 miles. Find the diameter of planet A.
A. 5992 mi B. 5899 mi C. 5989 mi D. 5999 mi
Solve the problem.Consider the following simplified digital photograph that has a 3 × 3 grid with four gray levels numbered from 0 to 3. It shows a letter Y in dark gray on a white background.
Let A be the 3 × 3 matrix that represents this figure digitally. Find the matrix B such that A + B will represent the entire picture becoming one gray level darker.
A. 
B. 
C. 
D. 