For right triangle ABC, m
= 90°. If b = 8 and c = 12, find cos B (or cos 
).
What will be an ideal response?
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Find 
and 
.f(x, y) = sin2 (2xy2 - y)
A. 
= 4y2sin (2xy2 - y) cos (2xy2 - y); 
= 2sin (2xy2 - y) cos (2xy2 - y)
B. 
= 2sin (2xy2 - y) cos (2xy2 - y); 
= (8x - 2) sin (2xy2 - y) cos (2xy2 - y)
C. 
= 2sin (2xy2 - y) cos (2xy2 - y); 
= 2sin(2xy2 - y) cos(2xy2 - y)
D. 
= 4y2sin (2xy2 - y) cos (2xy2 - y); 
= (8xy - 2) sin (2xy2 - y) cos (2xy2 - y)
Find the product.(-11a3x4)(6a9x9 + 8x5 - 10a)
A. -66a9x9 - 88x5 + 110a B. -66a12x13 + 8x5 - 10a C. -66a12x13 - 88a3x9 - 10a D. -66a12x13 - 88a3x9 + 110a4x4
Solve the problem.If each angle of a regular polygon measures 144°, how many sides does it have?
A. 3 sides B. 12 sides C. 1 sides D. 10 sides
Provide an appropriate response.Solve: 
= 2
A. x = -4, x = 8 B. x = 4, x = 8 C. x =-4, x = -8 D. x = -4, x = -8