Multiply and simplify.
? 
A. 
B. 
C. 
D. 
Answer: B
Mathematics
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Factor out the greatest common factor with a negative coefficient.-42x9y9 - 60x7y6 + 24x5y2
A. -6x5y2(7x4y7 - 10x2y4 + 4) B. -6(7x9y9 - 10x7y6 - 4x5y2) C. -6x5y2(7x4y7 + 10x2y4 - 4) D. -6x5(7x4y9 - 10x2y6 + 4y2)
Mathematics
Find the focus and directrix of the parabola with the given equation.11x2 = 40y
A. Focus: 
, directrix: y = 
B. Focus: 
, directrix: y = - 
C. Focus: 
, directrix: y = - 
D. Focus: 
, directrix: x = - 
Mathematics
Prove the identity.
?
What will be an ideal response?
Mathematics
Given C = 118°, a = 7, and b = 13, use the Law of Cosines to solve the triangle for the value of c. Round your answer to two decimal places. ?
A. 16.68 B. 11.51 C. 15.94 D. 17.42 E. 14.47
Mathematics