Solve.A contractor finds that it takes Sam Tockett 9 hours to construct a wall of a certain size. It takes Jim Lowell 6 hours to construct the same wall. How long would it take if they worked together?
A. 1 hr
B. 15 hr
C. 3
hr
D. 
hr
Answer: C
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Determine whether or not the given pair of values is a solution of the given system.x = -0.2, y = 0.6
A. Yes B. No
Solve the problem.On the April 25 billing date, Malcolm had a balance due of $1516.06 on his credit card. The transactions during the following month were: 
The interest rate on the card is 1.4% per month. Using the average daily balance method, find the balance due on May 25 (April has 30 days).
A. $2205.25 B. $1542.91 C. $2204.54 D. $2198.91
Provide an appropriate response.2
= ? (percent)
A. 257
%
B. 2.57
%
C. 37.5%
D. 25.7
%
E. none of the above
Solve.The population growth of an animal species is described by 
where t is the number of months since the species was introduced. Find the population of this species in an area 6 months after the species is introduced.
A. 240 B. 470 C. 74 D. 704