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

Mathematics

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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

Mathematics

Simplify.

A. 4
B. 16
C. 4
D. 4 

Mathematics

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

Mathematics

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.

Mathematics