Find the limit, if it exists. 
Does not exist
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Solve the problem. Round to the nearest cent unless otherwise noted.The amount of markup on a store item is $18. Find the cost to the store if the markup is 20%.
A. $3.60 B. $15.00 C. $90.00 D. $21.60
Solve the problem.The time t, in minutes, needed for clothes hanging on a line outdoors to dry, at a specific temperature and wind speed, depends on the humidity, h. The time can be approximated by the equation 
where h is the humidity expressed as a decimal number. Find the length of time required for clothing to dry if there is 31% humidity. Round your answer to 2 decimal places.
A. 64.99 min B. 65.78 min C. 63.56 min D. 66.22 min
Graph the solution set of the system of inequalities or indicate that the system has no solution.
A. 
B. 
C. 
D. 
Multiply the real numbers. Write any improper fraction as a whole or mixed number where appropriate.(-9)(-4)
A. -40 B. 36 C. 40 D. -36