Write a formula for the nth term of the arithmetic sequence. Use the formula to find the 20th term of the sequence.10, 1 , -8, -17, . . .
A. an = 9n - 19; a20 = 161
B. an = -9n + 10; a20 = -170
C. an = -9n + 19; a20 = -161
D. an = 9n - 10; a20 = 170
Answer: C
Mathematics
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i - 
j - 
k
A. f(x, y, z) = - 
+ C
B. f(x, y, z) = 
+ C
C. f(x, y, z) = 
+ C
D. f(x, y, z) = 
+ C
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A. {2 cis 180°, 2 cis 60°, 2 cis 300°} B. {2 cis 180°, 2 cis 240°, 2 cis 240°} C. {2 cis 180°, 2 cis 120°, 2 cis 300°} D. {2 cis 180°, 2 cis 120°, 2 cis 240°}
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Solve the problem.Find the missing length in the following right triangle. If necessary, round to the nearest tenth. 
A. 14 in. B. 221 in. C. 21 in. D. 442 in.
Mathematics
Identify the like terms in the expression:
Mathematics