Write the vector v in the form ai + bj, given its magnitude 
and the angle ? it makes with the positive x-axis.
= 15, ? = 60°
A. v = 
i + 
j
B. v = - 
i - 
j
C. v = 
i + 
j
D. v = 
i + 
j
Answer: A
Mathematics
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Find the angle.tan-1 0
A. - 
B. 1
C. 0
D. -1
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Solve the differential equation.
- 
= ( ln x)2
A. y = 
(ln x) 3 + cx
B. y = x (ln x) 3 + cx
C. y = 
x (ln x) 3 + cx
D. y = 
x3 + cx
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Find the constant of proportionality for the stated conditions: z is directly proportional to t, and 
when 
.
?
A. ?
B. ?
C. 
D. ?
E. ?
Mathematics
Simplify. Do not leave negative exponents in your answer. 
-2
A. 
B. 
C. 
D. 
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