Write the vector v in terms of i and j whose magnitude 
and direction angle ? are given.
= 10, ? = 120°
A. v = -5
i + 5
j
B. v = 5i - 5
j
C. v = -5i + 5
j
D. v = 5
i - 5j
Answer: C
Mathematics
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Provide an appropriate response.Derive the identity sec-1(-x) = ? - sec-1 x by combining the following two equations:cos-1(-x) = ? - cos-1 xsec-1 x = cos-1(1/x)
What will be an ideal response?
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The distance D, in miles, from a moving train to a home is given by
.
Here t is the time in hours since the train left the station. For what values of t is the train less than 2 miles from the home?
?
A. 
hours
B. 
hours
C. 
hours
D. 
hours
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(4x + 11)(x + 3)
A. x2 + 23x + 22 B. 4x2 + 22x + 33 C. 4x2 + 23x + 33 D. x2 + 33x + 23
Mathematics
Solve. Try factoring first. If factoring is not possible or is difficult, use the quadratic formula.9k2 - 64 = 0
A. 
, - 
B. 
, - 
C. 
, 0
D. 8, 0
Mathematics