When Marcus was 6 years old, his dad planted a 7 foot maple tree. They can grow up to 2 feet per year. The tree is now 25 feet tall. How many years ago did his dad plant the tree

So we know that Marcus was 6 when they planted a 7 foot maple tree (how do they even "plant" that thing?), and it grows 2 feet per year.

So that means it grew 25-7 =  18 feet.

18 / 2 = 9.

So that means it grew 18 feet in 9 years.

That means that Marcus's dad planted the tree 9 years ago.

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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