Solve the problem.Find the table that matches the given graph.
A. 
B. 
C. 
D. 
Answer: D
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Solve.If y varies directly as x, and y = 3 when x = 8, find y when x = 40.
A. 15
B. 
C. 
D. 
Solve the problem.The amount of water used to take a shower is directly proportional to the amount of time that the shower is in use. A shower lasting 21 minutes requires 10.5 gallons of water. Find the amount of water used in a shower lasting 5 minutes.
A. 105 gal B. 2.5 gal C. 3 gal D. 2 gal
Solve the problem.The decay of 353 mg of a radioactive substance is given by A(t) = 353e-0.03t, where t is time in years. Find the amount left after 80 years.
A. 16 mg B. 343 mg C. 32 mg D. 31 mg
Use the elimination method by addition to find the solution for the following system.
A. x = 7, y = -4 B. x = 7, y = -5 C. x = -7, y = -5 D. The system is inconsistent.