Find the unit tangent vector of the given curve.r(t) = 12t8i - 4t8j + 3t8k
A. T = 
i - 
j + 
k
B. T = 
i - 
j - 
k
C. T = 
i + 
j + 
k
D. T = 
i - 
j + 
k
Answer: A
Mathematics
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Find all solutions by factoring.14x2 + 16x = 0
A. - 
, -16
B. - 
, 16
C. - 
, 0
D. 0
Mathematics
Find the radius of convergence and the interval of convergence of the power series.
 FIGURE 1.png)
Mathematics
Use a calculator to find the acute angle ? (to the nearest tenth of a degree) that satisfies the equation.? = cos-1 (0.3998624)
A. 293.6° B. 23.6° C. 66.4° D. 113.6°
Mathematics
Find the equation of the least squares line.The paired data below consist of the test scores of 6 randomly selected students and the number of hours they studied for the test. 
A. y = 33.7 + 2.14x B. y = 33.7 - 2.14x C. y = -67.3 + 1.07x D. y = 67.3 + 1.07x
Mathematics