Find an equation y = mx + b that models the quantity y after x units of time.A quantity is initially 6 and remains constant.
A. y = -6
B. y = 6
C. y = 6x
D. y = -6x
Answer: B
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Solve the problem.In a chemical reaction, the rate at which the amount of a reactant changes with time is proportional to the amount present, such that 
, when t is measured in hours. If there are 
of reactant present when t = 0, how many grams will be left after 
? Give your answer to the nearest tenth of a gram.
A. 2.2 g B. 6.7 g C. 4.5 g D. 0.1 g
Use the distributive property to rewrite the algebraic expression without parentheses. Then simplify the result, if possible.3(x + y)
A. 3xy B. 3x + y C. 3x + 3y D. 3x - 3y
Solve.When 18 is subtracted from 7 times a certain number, the result is 213. What is the number?
A. - 
B. 1473
C. 44
D. 33
Use the line graph to answer the question.The line graph shows the 2001 sales data for the Big "D" company. 
Which month had the lowest sales?
A. Month 3 B. Month 7 C. Month 2 D. Month 5