Express the unit vector as indicated.The unit vector u = (cos ?)i + (sin ?)j for ? = - 
obtained by rotating i ? radians about the origin. Express u in the form ai + bj.
A. 
i - 
j
B. 
i + 
j
C. 
i + 
j
D. 
i - 
j
Answer: D
Mathematics
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Determine whether the graph has a Hamilton circuit.
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Find the length of the curve.The circle r = 9 sin ?
A. 
?
B. 18?
C. 81?
D. 9?
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Determine the metric unit that would best be used to measure the volume.The volume of cough medicine in a single dose
A. kiloliters B. cubic centimeters C. cubic meters D. liters
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Translate the sentence to an equation using the variable x. Then solve the equation.The sum of a number and 5 is 18.
A. 5x = 18; 
B. x + 18 = 5; -13
C. x = 5 + 18; 23
D. x + 5 = 18; 13
Mathematics