Perform the indicated operation. Simplify the answer if possible.
A. 
B. 
C. 
D. 
E. 
F. 
Answer: F
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Calculate the unit vector u = (cos ?)i + (sin ?)j for the given direction angle.? = 
A. 
i - 
j
B. - 
i - 
j
C. - 
i + 
j
D. 
i + 
j
Provide an appropriate response.For any value x, the point (x, 0) lies on the axis.
Fill in the blank(s) with the appropriate word(s).
Find the sum.-14.8 + (-23.6)
A. -8.8 B. -38.4 C. 8.8 D. 38.4
Solve by graphing. Label the axes and show where the solution is located on the graph.The graph depicts a relationship between scores achieved on an unspecified standardized test and family income. Suppose the score for a test is 490 when the family income is $25,000 and is 530 when the family income is $55,000. Let x be the income and y be the score of the test. Graph the two given pairs of incomes and scores. Assume that the relationship is linear. Draw a line though the two previous points. From your graph, estimates the score if the family income is $40,000.
A. 
550
B. 
510
C. 
570
D. 
530