Chelsey put $450 into an account with a simple interest rate of 2.5%. When she withdrew the money she had earned a total of $67.50 in interest. How long did she leave the money in the account?

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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rauschg

rauschg · hand

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it is x equals 3   plese mark me really need it

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answer: rolling a number cube and flipping a coin.

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b

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write an equation for the line of best fit. then predict the number of milk cow operations in the year 2005.