Solve the equation.
A. y = -9
B. y = -8
C. y = -13
D. y = 13
E. y = -2
Answer: A
Mathematics
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At what points is the given function continuous?f(x, y) = 
A. All (x, y) such that x ? 0
B. All (x, y)
C. All (x, y) such that x ? 
and x ? -2
D. All (x, y) satisfying x - y ? 0
Mathematics
Find the unit tangent vector T and the principal unit normal vector N. r(t) = (t2 - 5)i + (2t - 5)j + 8k
A. T = 
i - 
j; N = - 
i - 
j
B. T = 
i + 
j; N = 
i + 
j
C. T = 
i + 
j; N = 
i - 
j
D. T = 
i + 
j; N = 
i - 
j
Mathematics
Simplify.
A. 4x - 8y2
B. 
C. 
D. 
Mathematics
Find the unknown side of the right triangle. Use a calculator or square root table when necessary and round to the nearest thousandth.
A. 12 m B. 17.493 m C. 153 m D. 306 m
Mathematics