Simplify the expression.
÷ 
A. 
B. 
C. 
D. 
Answer: D
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For the given complex number, determine the complex conjugate in trigonometric form.2
(cos (-40°) + i sin (-40°))
A. 2
(cos (40°) + i sin (40°))
B. 
(cos (-40°) + i sin (-40°))
C. 2
(cos (40°) + i sin (-40°))
D. 
(cos (-40°) + i sin (40°))
Solve the problem that involves probabilities with independent events.A spinner is used for which it is equally probable that the pointer will land on any one of six regions. Three of the regions are colored red, two are colored green, and one is colored yellow. If the pointer is spun twice, find the probability it will land on green and then yellow.
A. 
B. 
C. 
D. 
Round off a measurement of 0.23559g to three significant digits.
A. 0.24g B. 0.235g C. 0.2355g D. 0.236g
Solve.Amy teaches Chinese lessons for $95 per student for a 6-week session. From one group of students, she collects $2,850. How many students are in the group?
A. 32 students B. 34 students C. 30 students D. 20 students