Solve.The population of a particular city is increasing at a rate proportional to its size. It follows the function 
where k is a constant and t is the time in years. If the current population is 47,000, in how many years is the population expected to be 117,500? (Round to the nearest year.)
A. 31 yr
B. 193 yr
C. 18 yr
D. 13 yr
Answer: A
Mathematics
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Describe the domain of the function of three or more varables.f(x, y, z) = x ln 
A. All points in ?3 that satisfy yz > 0. B. All points in ?3. C. All points in ?3 that satisfy yz ? 0. D. All points in ?3 that satisfy x > 0.
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Solve the equation.
x = 
A. 4
B. -4
C. 
D. - 
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This is a sketch of the region between the two curves y = x2 - 15, below the x-axis and also below the line 
Does the following represent the area of the region? 
Enter just "yes" or "no".
Fill in the blank(s) with the appropriate word(s).
Mathematics
Multiply. Use the special formula that applies.(7 - 12r)(7 + 12r)
A. 49 - 168r - 144r2 B. 49 - 144r2 C. 49 - 12r2 D. 49 + 168r - 144r2
Mathematics