Solve by the substitution method. x + y = 29x + 9y = 18
A. ?
B. {(x, y)| x + y = 2}
C. {(0, 0)}
D. {(6, -4)}
Answer: B
Mathematics
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Find the unit tangent vector of the given curve.r(t) = 
i + 
j - 12tk
A. T = 
i + 
j - 
k
B. T = 
i + 
j - 
k
C. T = 
i + 
j - 
k
D. T = 
i + 
j - 
k
Mathematics
Sketch the graph of the function. Give the coordinates of the vertex.f(x) = 3(x + 3)2 + 1
A. vertex (-1, 3)
B. vertex (3, 1)
C. vertex (-3, 1)
D. vertex (1, -3)
Mathematics
Find the limit.
A. -7 B. ? C. -9 D. 0
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Find the exact value of the expression.sin 60° - cos 30°
A. 0
B. 1
C. 
D. 
Mathematics