Select all of the situations that could be modeled by a linear equation. a: the barton family is driving at a rate of 62 miles per hour. b: mr. dominguez invested $1000. this money is growing at a rate of 4% per year. c: a tree was 10 feet tall when purchased. it is growing at a rate of 2 feet per year. d: time dropped a coin off a bridge. it is falling at a rate of 9.8 meters per second squared. e: the amount of people in a stadium is decreasing at a rate of 45% every 10 minutes.

what is the starting amount? the question is not clear sorry.

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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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