Solve the system analytically. x + y + z = -2 x - y + 4z = -133x + y + z = -12
A. ?
B. {(-1, 4, -5)}
C. {(-5, 4, -1)}
D. {(-1, -5, 4)}
Answer: C
Mathematics
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Compute the unit binormal vector and torsion of the curve. r(t) = 
A. B(t) = 
, ? = 1
B. B(t) = 
, ? = 0
C. B(t) = 
, ? = 1
D. B(t) = 
, ? = 0
Mathematics
Find the exact value of the expression.sin 20° cos 100° + cos 20° sin 100°
A. 
B. 
C. - 
D. - 
Mathematics
Solve the problem.Midtown Antiques collects 2% sales tax on all sales. If total sales including tax are $1551.17, find the portion that is the tax amount.
A. $31.02 B. $20.42 C. $30.42 D. $1520.75
Mathematics
Write the inequality in interval notation.-1 < x < 3
A. [-1, 3) B. (-1, 3] C. [-1, 3] D. (-1, 3)
Mathematics