Use the Gauss-Jordan method to solve the system of equations. -2x - 9y = 7 -4x - 18y = -9
A. 
B. (7, -9)
C. (2, 2)
D. No solution
Answer: D
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Solve the problem.The population of a particular city is increasing at a rate proportional to its size. It follows the function 
where k is the current population and t is the time in years. If the current population is 13,000, in how many years is the population expected to be 32,500? (Round to the nearest year.)
A. 8 yr B. 3 yr C. 50 yr D. 5 yr
Find the slope of the line containing the points (2,9 ) and (?5,?6 ) .
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Convert the given number to scientific notation.690,000
A. 6.9 × 10-6 B. 6.9 × 10-5 C. 6.9 × 105 D. 6.9 × 106