Which of the following best explains why cos 2pi/3 is not equal to cos 5pi/3
a. the angles do not have the same reference angle.
b. cosine is negative in the second quadrant and positive in the fourth quadrant.
c. cosine is positive in the second quadrant and negative in the fourth quadrant.
d. the angles do not have the same reference angle or the same sign.

percentage - 25%

probability - 0.25

we know,

total amount of students in class = 20

total boys = 10

total girls = 10

no of girls who wear glasses = 10/2 = 5

probability of choosing a girl with glasses is =

number of girls wearing glasses/total number of students in the class = 5/20

thus, percentage of selecting a girl wearing glasses will be

= 5/20 × 100

= 5 × 5

25%

therefore,

probability will be 0.25

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