In a class of 25 students, 5 have a brother and 11 have a sister. There are 2 students who have a brother and a sister. What is the probability that a student chosen randomly from the class has a brother and a sister?

b.an increase in a causes b to decrease

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step-by-step explanation:

these sign is used to tell weather the number is greater or less than the number   <   or >     but this sign means its equal =    

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step-by-step explanation:

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answer:   x (x+6)^2, choice b

discussion:

factor x out of the equation:

x^3 + 12x^2 + 36x = x (x^2 + 12x + 36).

note that 6+6 = 12 and 6*6 = 36 so the above factors into:

x (x+6)^2

which is choice b

you,

mrb