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.)

is only a line? i think so

207/8 is the right

answer: a video game has three difficulty levels: easy, medium, and expert. the game's scoring works in such a way that a player has to score a fixed number of points to advance to the next level, and then the scoring starts over. the total score needed to clear all three difficulty levels is 7,500. two times the number of points needed to clear the easy level is 500 more than the number of points needed to clear the medium level. twice the number of points needed to clear the medium difficulty level is 1,500 more than the number of points needed to clear the expert level. if x, y, and z represent the easy, medium, and expert levels, respectively, and a is the coefficient matrix of the system of equations modeling this situation, identify the inverse matrix, a-1, and the solution matrix, x, of the system of equations.

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