Answer the question or solve the problem.True or False? If x < 4 then -2x < -8.
A. True
B. False
Answer: B
Mathematics
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Verify the identity.cos 
= -sin x
What will be an ideal response?
Mathematics
Use a graphing calculator to determine which expression completes the identity.The expression 
is to be the left hand side of an equation that is an identity. Which one of the following four expressions can be used as the right hand side of the equation to complete the identity?
A. cos x + 1 B. tan x - sec x C. cot x + sin2x D. sin x + cos x
Mathematics
Find the center and the radius of the circle.x2 + y2 + 6x + 8y + 25 = 81
A. (3, 4), r = 81 B. (4, 3), r = 81 C. (-3, -4), r = 9 D. (-4, -3), r = 9
Mathematics
Find the values of the variables.
= 
A. x = 7, y = 7, z = 9 B. x = -7, y = -7, z = -9 C. x = -7, y = 9, z = 7 D. x = 7, y = 9, z = 7
Mathematics