Solve the equation.
?
?
A. 
B. 
C. 
D. 
E. 
Answer: B
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Find 
. Write your answer in standard polar form with the argument in radians.z1 = 5(cos 200° + i sin 200°), z2 = 4(cos 50° + i sin 50°)
A. 
(cos 150° - i sin 150°)
B. 
(sin 150° + i cos 150°)
C. 
(cos 250° + i sin 250°)
D. 
(cos 150° + i sin 150°)
Graph the equation.x + 2 = 0
A. 
B. 
C. 
D. 
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. Suppose that a 
person bends at an angle of 30°. Determine the force exerted by the person's back muscles, and estimate the angle that requires the back muscles to exert a force of 381 pounds. Round the force to the nearest pound, and the angle to the nearest tenth, if necessary.
A. 318 pounds; 47.3° B. 26 pounds; 53.2° C. 551 pounds; 53.2° D. 551 pounds; 30°
Find the derivative of y with respect to the independent variable.y = (cos ?)
A. -
cos ? sin ?
B. -(cos ?)
-1 sin ?
C. 
(cos ?)
-1
D. -
(cos ?)
-1 sin ?