Find the directrices of the ellipse.16x2 + 4y2 = 64
A. y = ± 
B. x = ± 
C. x = ± 
D. y = ± 
Answer: D
Mathematics
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Determine whether the following is always true or not always true. Given reasons for your answers.u × 0 = 0
What will be an ideal response?
Mathematics
Divide using synthetic division.x2 + 7x - 14 divided by x + 9
A. x - 4 + 
B. x + 2 + 
C. x - 2
D. x - 2 + 
Mathematics
Solve the problem.A washer is made by removing a circular disk from the center of another circular disk of radius 4 mi. If the disk that is removed has radius x, write a completely factored polynomial whose values give the area of the washer.
A. ?(8 - x)2 B. ?(8 - x)(8 + x) C. ?(4 - x)(4 + x) D. ?(4 - x)2
Mathematics
Approximate the integral by the trapezoidal rule.
dx; n = 4Express your answer to five decimal places.
A. 9.63417 B. 2.40854 C. 1.50455 D. 4.81709
Mathematics