Twenty percent of U. S. mortgages are “underwater” (The Boston Globe, March 5, 2009). A mortgage is considered underwater if the value of the home is less than what is owed on the mortgage. Suppose 100 mortgage holders are randomly selected. a. What is the probability that exactly 15 of the mortgages are underwater? (Round your answer to 4 decimal places.)

b. What is the probability that more than 20 of the mortgages are underwater? (Round your answer to 4 decimal places.)

c. What is the probability that at least 25 of the mortgages are underwater? (Round your answer to 4 decimal places.)

i found two solutions,   n = 2 • ± √3 = ± 3.4641

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answer: b. f(x) = (x + 2)^3 (x^2 - 7x + 3)^4

step-by-step explanation:

polynomials always have as many roots as their order. this is a 4th order polynomial- hence 4 roots!

complex roots of polynomials always come in pairs. the quadratic equation has the "+/-" in that will alwaysgenerate m+ni amd m-ni, so 7-2i must be a root of this polynomial equation.

the order of the numerator and denominator are both 2. so the horizontal asymptote is y=a2/b2 =7

verticle asymptotes are the forbidden x-values. f(x) becomes undefined at x=-3 because this value will cause a zero denominator.

a graph of r(x) will have vertical asymptotes at ±1 because these values will make the denominator zero. so the domain of the function cannot include ±1.

you 're wlecome! : )

cretdit to source

not me

step-by-step explanation:

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