Find the indicated product.Let A = {6, 7, 8} and B = {x, y, z} determine B × A.
A. {(6, x), (7, y), (8, z)}
B. {(x, 6), (x, 7), (x, 8), (y, 6), (y, 7), (y, 8), (z, 6), (z, 7), (z, 8)}
C. {(x, 6), (y, 7), (z, 8)
D. {(6, x), (6, y), (6, z), (7, x), (7, y), (7, z), (8, x), (8, y), (8, z)}
Answer: B
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Find the unit tangent vector of the given curve.r(t) = (10 - 2t)i + (2t - 10)j + (4 + t)k
A. T = 
i - 
j - 
k
B. T = - 
i + 
j + 
k
C. T = 
i - 
j - 
k
D. T = - 
i + 
j + 
k
Simplify the expression.  figure 1.png)
 figure 2.png)
Find the domain and range and describe the level curves for the function f(x,y).f(x, y) = 7x2 - 2y2
A. Domain: all points in the x-y plane; range: all real numbers; level curves: ellipses 
B. Domain: all points in the first quadrant of the x-y plane; range: all real numbers; level curves: hyperbolas 
C. Domain: all points in the x-y plane; range: all real numbers; level curves: hyperbolas 
D. Domain: all points in the x-y plane; range: real numbers z ? 0; level curves: ellipses 
Evaluate the expression for the given replacement values.x - 3y, for x = 32.3, y = 8.2
A. 21.1 B. 7.70 C. 248.46 D. 72.30