Use an inequality to describe the interval of real numbers.x is between -3 and 5.
A. -5 < x < 3
B. -3 ? x ? 5
C. -3 < x < 5
D. x ? 5
Answer: C
Mathematics
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Find the unit tangent vector of the given curve.r(t) = (4 - 2t)i + (2t - 9)j + (10 + t)k
A. T(t) = 
i - 
j - 
k
B. T(t) = - 
i + 
j + 
k
C. T(t) = 
i - 
j - 
k
D. T(t) = - 
i + 
j + 
k
Mathematics
Use transformations of the graphs of y = x2 or y = |x| to sketch a graph of f by hand.f(x) = -4(x + 3)2 + 1 
A. 
B. 
C. 
D. 
Mathematics
Add.6373
A. 22 B. 25 C. 20 D. 23
Mathematics
Solve the problem.Assume that the sales of a certain appliance dealer are approximated by a linear function. Suppose that sales were $14,500 in 1982 and $65,500 in 1987. Let x = 0 represent 1982. Find the equation giving yearly sales S.
A. S = 51,000x + 14,500 B. S = 10,200x + 65,500 C. S = 10,200x + 14,500 D. S = 51,000x + 65,500
Mathematics