Solve the equation.x2 - 4x + 4 = 0
A. 0, 2
B. 2
C. -2
D. -2, 2
Answer: B
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Find the largest open interval where the function is changing as requested.Decreasing f(x) = 
A. (-4, ?) B. (-?, -4) C. (-?, 4) D. (4, ?)
Use a graphing calculator to determine which expression completes the identity.The expression 
is to be the left hand side of an equation that is an identity. Which one of the following four expressions can be used as the right hand side of the equation to complete the identity?
A. csc2x B. sec2x C. -cos2x D. tan2x
Planets travel in elliptical orbits with the sun at one focus. Assume that the focus is at the pole, the major axis lies on the polar axis, and the length of the major axis is 2a (see figure). The polar equation of the orbit of a planet is given below, where e is the eccentricity. If 
miles and 
find the perihelion distance (the minimum distance from the sun to the planet). Round your answer to the nearest mile.
A) 86,596,392 miles
B) 91,219,608 miles
C) 8,659,639 miles
D) 9,121,961 miles
E) 865,963,920 miles
Let A = {2, 4, 10, 17}, B = {17, 15}, and C = {10, 17, 22}. Find n(A?B?C).
 figure 1.png)