Use the given triangles to evaluate the expression. Rationalize all denominators. 
tan 45°
A. 
B. 
C. 
D. 1
Answer: D
Mathematics
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Find the series' radius of convergence.
A. ?, for all x B. 2 C. 0 D. 1
Mathematics
Write the function in the form y = f(u) and u = g(x). Then find dy/dx as a function of x.y = cos4 x
A. y = u4; u = cos x; 
= 4 cos3 x sin x
B. y = cos u; u = x4; 
= - sin(x4)
C. y = cos u; u = x4; 
= - 4x3 sin(x4)
D. y = u4; u = cos x; 
= - 4 cos3 x sin x
Mathematics
Find the probability.Two marbles are drawn without replacement from a box with 3 white, 2 green, 2 red, and 1 blue marble. Find the probability that both marbles are white.
A. 
B. 
C. 
D. 
Mathematics
Write the expression as a pure imaginary number.
A. -6i
B. 
i
C. ±6
D. 6i
Mathematics