Find the center and the radius of the circle.(x + 4)2 + y2 = 64
A. (-4, 0), r = 8
B. (0, 4), r = 8
C. (0, -4), r = 64
D. (4, 0), r = 64
Answer: A
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Find the focus and directrix of the parabola.y2 = 8x
A. (2, 0); x = -2 B. (0, 2); y = -2 C. (2, 2); x = 2 D. (2, 0); x = 2
Multiply.(5x2 - 4)(x6 - 3)
A. 5x12 - 4x6 + 15x2 - 12 B. 5x12 - 4x6 - 15x2 - 12 C. 5x8 - 4x6 - 15x2 + 12 D. 15x8 - 4x6 - 15x2 + 12
Solve the problem.Persons taking a 30-hour review course to prepare for a standardized exam average a score of 620 on that exam. Persons taking a 70-hour review course average a score of 785. Find a linear function, S(t), which fits this data, and which expresses score as a function of time. Use this function to predict an average score for persons taking a 56-hour review course. Round your answer to the tenths place.
A. 741.3 B. 720.0 C. 727.3 D. 731.5
Rationalize the denominator and simplify.
A. 
B. 
C. 
D. 