Factor completely, if possible.-405x2 + 180xy - 20y2
A. -5(9x - 2y)2
B. 5(9x + 2y)2
C. -5(9x + 2y)2
D. -5(9x + 2y)(9x - 2y)
Answer: A
Mathematics
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Express the angular speed in radians per second.420 revolutions per second
A. 420 radians per second B. 840? radians per second C. 840 radians per second D. 420? radians per second
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Solve the equation.x = log10 0.0000001
A. 
B. 
C. 
D. 
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Solve the equation by the method of your choice. Simplify irrational solutions, if possible.x2 + 18x + 66 = 0
A. {-18 ± 
}
B. {-9 ± 
}
C. {9 ± 
}
D. {9 ± 
}
Mathematics
Solve the problem.A lot is in the shape of a right triangle. The shorter leg measures 90 m. The hypotenuse is 30 m longer than the length of the longer leg. How long is the longer leg?
A. 180 m B. 150 m C. 90 m D. 120 m
Mathematics