Evaluate the discriminant, and predict the type and number of solutions.4x2 - 144 = 0
A. 0, one rational
B. 2304, two different rational
C. 2304, two different irrational
D. -2304, two different imaginary
Answer: B
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Rewrite the equation such that each resulting term or combination is in an integrable form.y dx + xy2 dy + y3 dx = x dy
A. 
+ (xy dy + y2 dx) = 0
B. 
+ (x dy + y dx) = 0
C. (y dx - x dy) + (xy2 dy + y3 dx) = 0
D. 
+ (y dy - x dy) = 0
Add.(-9x7 - x4y3 + x3y4 + 3y7) + (18x7 - x4y3 - 3x2y5 + 4xy6 - 2y7)
A. 9x7 + 2x4y3 + x3y4 + 3x2y5 - 4xy6 - y7 B. 9x7 + x3y4 - 3x2y5 + 4xy6 - y7 C. 9x7 - 2x4y3 + x3y4 + y7 D. 9x7 - 2x4y3 + x3y4 - 3x2y5 + 4xy6 + y7
Establish the identity.cos(x - y) - cos(x + y) = 2 sin x sin y
What will be an ideal response?
Solve.In a particular city, 
of the residents subscribe to the local newspaper. Write 
as a percent.
A. 12.5% B. 0.125% C. 1.25% D. 0.0125%