Match the graph to the correct inequality.
A. y ? x
B. y ? x
C. y ? -x
D. y ? -x
Answer: B
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A turkey is removed from the oven when its temperature reaches 175°F and is placed on a table in a room where the temperature is 70°F. After 10 minutes the temperature of the turkey is 161°F and after 20 minutes it is 149°F. Use a linear approximation to predict the temperature of the turkey after 30 minutes.
What will be an ideal response?
Write the expression in the form a + bi.
A. 
+ 
i
B. - 
+ 
i
C. - 
- 
i
D. 
- 
i
Mark as true any statement that is always true. Mark as false any statement that is never true or that is not necessarily true. Be able to justify your answers.
1. The y-intercept of the line with equation 2x + 3y = 5 is 5/3. 2. To find the equation of a line, it is sufficient to know two points on the line. 3. The point P(1, 1) lies on the circle with radius 1 and center (1, 1). 4. A system of two linear equations has exactly one solution. 5. If three vertices of a parallelogram are (0, 0), (2, 0) and (5, 4), then the fourth vertex is (7, 4). 6. If three of the vertices of a rectangle are (-a, 0), (a, 0) and (-a, b), then the fourth vertex is (a,-b).
Solve the problem.The average value of a certain type of automobile was $14,400 in 1994 and depreciated to $8220 in 1998. Let y be the average value of the automobile in the year x, where x = 0 represents 1994. Write a linear equation that models the value of the automobile in terms of the year x.
A. y = - 
x - 8220
B. y = -1545x + 2040
C. y = -1545x + 8220
D. y = -1545x + 14,400