Factor completely. If unfactorable, indicate that the polynomial is prime.81x2 - 126xy + 49y2

A. (9x + 7y)2
B. (81x + 1)(x + 49)
C. (9x - 7y)(9x + 7y)
D. (9x - 7y)2


Answer: D

Mathematics

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Solve the problem.A rotating beacon is located a distance d from a long wall. The distance d is given by , where t is the time measured in seconds since the beacon started rotating. Solve the equation for t.

A. t = 2? arctan 
B. t =  tan 
C. t =  arctan 
D. t = 2? tan 

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Graph the equation by completing the table of values.y = 2x2 + 1  

A.
  

B.
  

C.
  

D.
  

Mathematics

Determine whether or not the number is written in scientific notation.0.0005

A. Yes B. No

Mathematics

Write two equivalent expressions, one with parentheses and one without, for the opposite of the polynomial.-6a3 + 2a2 + 2a - 3

A. - (6a3 - 2a2 - 2a - 3), -6a3 - 2a2 - 2a - 3 B. - (6a3 - 2a2 - 2a - 3), -6a3 + 2a2 + 2a + 3 C. - (-6a3 + 2a2 + 2a - 3), 6a3 - 2a2 - 2a + 3 D. - (-6a3 - 2a2 - 2a - 3), 6a3 + 2a2 + 2a - 3

Mathematics