Write the complex number in trigonometric form r(cos ? + i sin ?), where r is exact and -? < ? ? ?.6 - 6
i
A. 12 
B. 6 
C. 12 
D. 6 
Answer: C
Mathematics
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Solve the problem.When a person bends at the waist with a straight back, the force, F, exerted by the person's lower back muscles can be estimated with the formula 
where w is the person's weight, and ? is the angle made by the person's torso relative to the horizontal. Use the sum identity for sine to simplify F.
A. F = 2.89w sin ? B. F = 2.89w (sin ? + cos ?) C. F = -2.89w cos ? D. F = 2.89w cos ?
Mathematics
Multiply the expressions.(x + 5y)(x - 5y)
A. x2 - 10xy - 25y2 B. x2 - 10y2 C. x2 - 25y2 D. x2 + 10xy - 25y2
Mathematics
Use the table to solve the equation.3(x - 1) = - 2(1 - x) 
A. x = 3 B. x = 1 C. x = 9 D. x = 0
Mathematics
Solve the equation. Check your solution.
+ 
= - 
A. 
B. 
C. 
D. 
Mathematics