For problems 3-7, solve the system of equations by substitution.
A. 
B. 
C. 
D. infinitely many solutions
E. no solution
Answer: C
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Solve.A country has a population of 8.7 million in 1995, a growth rate of 1.5% per year, and immigration from other countries of 46,000 per year. Predict the population in the year 2013.[Model the situation by using a differential equation of the form 
= ay + b with 
This differential equation has solution 
A. 11.1 million B. 13.2 million C. 12.3 million D. 11.5 million
Two pipes are used to fill a water storage tank. The first pipe can fill the tank in 8 hours, and the two pipes together can fill the tank in 4 hours less time than the second pipe alone. How long would it take for the second pipe to fill the tank? ?
A. 8 hours B. 16 hours C. 12 hours D. 15 hours E. 4 hours
In ?ABC, if a = 10, b = 11 and c =12, find ?A, ?B and ?C . Round to the nearest tenth.
Graph the function. State whether it is increasing, decreasing, or constant..f(x) = 4x + 6
A. increasing
B. decreasing
C. increasing
D. increasing