Write the expression as the cosine of an angle, knowing that the expression is the right side of the formula for 
with particular values for ? and ?.cos (160°) cos (40°) + sin (160°) sin (40°)
A. cos (220°)
B. cos (190°)
C. cos (210°)
D. cos (120°)
Answer: D
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A fixed point of f is a value of x that satisfies the equation f(x) = x; it corresponds to a point at which the graph of f intersects the line y = x. Find all the fixed points of the function. Use preliminary analysis and graphing to determine good initial approximations. Round approximations to six decimal places.f(x) = x2 - 5
A. x ? -1.291288, 2.291288 B. x ? -1.791288, 2.791288 C. x ? -2.291288, 2.291288 D. x ? -2.791288, 3.791288
Find the midpoint of the line segment whose end points are given.(4, 7) and (7, -6)
A. (11, 1)
B. (-3, 13)
C. (
, 
)
D. (- 
, 
)
Use a half-number identity to find an exact value for the function, given the information about x.cos 
, given cos x = - 
, with 
< x < ?
A. 
B. 
C. - 
D. - 
Solve for x.log3x = 1
A. 1
B. 0
C. 
D. 3