Write the sum of the geometric series as a rational number.0.91 + 0.0091 + 0.000091 + ...
A. 
B. 1
C. 
D. 
Answer: C
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Find the exact value of the expression.cos 40° cos 20° - sin 40° sin 20°
A. 
B. 
C. 
D. 
Use De Moivre's theorem to evaluate the expression. Write the result in standard form.i14
A. -1 B. -1 + i C. i D. 1 - i
Provide an appropriate response.What is the second step in a proof by mathematical induction?
A. Show that the statement is true for n = k. B. Show that the statement is true for n = k + 1. C. Show that, for any positive integer k, k ? n, if the statement is true for n = k, then it is true for n = k + 1. D. Show that the statement is true for n = 1.
Provide an appropriate response.The graph of an exponential function is given. Which of the following is the correct equation of the function?
A. y = 2.4x B. y = 0.31x C. y = 0.45x D. y = 1.8x