Simplify.i6
A. 1
B. -1
C. i
D. -i
Answer: B
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Which set of ordered pairs is a function? For each function, name the set of inputs (domain) and the set of outputs (range).
a. (7, 9), (7, 11), (7, 13) b. (7, 9), (9, 11), (11, 13) A) b is a function. Domain is {7, 9, 11}, range is {9, 11, 13}. B) a is a function. Domain is {7}, range is {9, 11, 13}. C) a is a function. Domain is {7}, range is {9, 11, 13}. b is a function. Domain is {7, 9, 11}, range is {9, 11, 13}. D) b is a function. Domain is {7}, range is {9, 11, 13}. a is a function. Domain is {7, 9, 11}, range is {9, 11, 13}. E) a and b are not functions.
Determine the vertex, focus, and directrix of the parabola and sketch its graph.(x + 3)2 = -16(y - 1)
A. vertex: (3, -1)
focus: (3, -5)
directrix: y = 3
B. vertex: (1, -3)
focus: (1, -7)
directrix: y = 1
C. vertex: (-3, 1)
focus: (-3, 5)
directrix: y = -3
D. vertex: (-3, 1)
focus: (-3, -3)
directrix: y = 5
Solve the problem.A formula for calculating the distance, d, that can be seen from an airplane to the horizon is 
where x is the altitude of the plane in feet. Find d when the altitude is 21,710 feet. Round your answer to the nearest hundredth.
A. 179.76 feet B. 279.76 feet C. 13,243.1 feet D. 148.56 feet
Subtract. Simplify, if possible.-8
- 
A. 7
B. -6
C. 10
D. -6