Find the unit vector having the same direction as v.v = -3i + j
A. u = - 
i - 
j
B. u = - 
i + 
j
C. u = -3
i + 
j
D. u = - 
i + 
j
Answer: B
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Use the fact that the trigonometric functions are periodic to find the exact value of the expression. Do not use a calculator.tan 720°
A. 
B. -1
C. 0
D. undefined
Provide an appropriate response.The revenue R for a product is given by R(x) = 2500x - x2 where x is the number of units sold. Is this function continuous for x = 20?
What will be an ideal response?
The table shows, for some particular year, a listing of several income levels and, for each level, the proportion of the population in the level and the probability that a person in that level bought a new car during the year. Given that one of the people who bought a new car during that year is randomly selected, find the probability that that person was in the indicated income category. Round your answer to the nearest hundredth. 
$50,000 and over
A. .24 B. .28 C. .22 D. .25
Convert the angle in radians to degrees.
A. 200?° B. 324° C. 162° D. 160°