Solve the problem.Your favorite stock opened the day at $30 per share and ended the day at $23 per share. Let x represent the amount of your gain or loss per share. An equation that represents the situation is 
Solve for x.
A. x = 7; gained $7 per share
B. x = 7; lost $7 per share
C. x = -7; gained $7 per share
D. x = -7; lost $7 per share
Answer: D
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Write the best-fit linear model for the data.The ages and lengths of several animals of the same species are recorded in the following table: 
Find the linear function to model this data.
A. y = 1.03x - 2.18 B. y = 0.93x + 2.18 C. y = 0.93x - 1.18 D. y = 2.18x - 1.03
Simplify the expression. If any variables exist, assume that they are positive.7
+ 4
A. -19
B. 5
C. 11
D. 19
Solve the problem.The function A = Aoe-0.0099x models the amount in pounds of a particular radioactive material stored in a concrete vault, where x is the number of years since the material was put into the vault. If 200 pounds of the material are placed in the vault, how much time will need to pass for only 41 pounds to remain?
A. 165 years B. 170 years C. 160 years D. 320 years
The graph of a quadratic function is given. Choose the function's equation.
A. f(x) = x2 - 3 B. f(x) = x2 + 3 C. f(x) = x2 + 6x + 9 D. f(x) = x2 - 6x + 9