Graph the inverse circular function.y = 
arccot x
A. 
B. 
C. 
D. 
Answer: C
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Find a formula for the nth term of the sequence.7, -7, 7, -7, 7 (7's with alternating signs)
A. an = 7(-1)2n+1 B. an = 7(-1)2n-1 C. an = 7(-1)n+1 D. an = 7(-1)n
Find the indicated angle or side. Give an exact answer.Find the exact length of side a.
A. 9
B. 7
C. 
D. 
Solve the problem.The table shows an area's population (in millions) every 10 years from 1975 to 2015. What was the difference in population from 1985 to 2015? 
A. 1.416 million B. 4.956 million C. 3.54 million D. 41.064 million
Use the Gauss-Jordan method to solve the system of equations. If the system has infinitely many solutions, let the last variable be the arbitrary variable.x - y + 2z + w = 1y + z = 4z - w = 1
A. {(2, 3, 1, w)} B. {(-2, 2, 2, 1)} C. ? D. {(2 - 4w, 3 - w, 1 + w, w)}