Indicate whether the function is one-to-one.{(8, 5), (7, 5), (13, 8)}
A. Yes
B. No
Answer: B
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Perform the indicated operation. If possible, simplify.Factor:2 cos x + 8 cos2 x
A. 2
B. cos x
C. 2 cos x
D. 2cos x
Use the graph to determine the x- and y-intercepts.
A. x-intercept: -1; y-intercept: 1 B. x-intercept: 1; y-intercept: 1 C. x-intercept: 1; y-intercept: -1 D. x-intercept: -1; y-intercept: -1
The area of a spherical polygon of n sides on a sphere of radius r is given by 
where ? is the sum of the measures of the angles of the polygon in degrees. Use the formula to find the area of a spherical quadrilateral with angles of 84°, 84°, 111°, and 111° on the Earth, which has a radius of 1980 miles. Round to the nearest 10,000 square miles.
Use Gauss-Jordan elimination to solve the linear system and determine whether the system has a unique solution, no solution, or infinitely many solutions. If the system has infinitely many solutions, describe the solution as an ordered triple involving variable z. x + y + z = 7 x - y + 2z = 7
A. (8, -3, 2)
B. 
C. (-3z + 14, 2z - 7, z)
D. (4, 1, 2)