Adiver begins at sea level and dives down 200 feet. he ascends at a steady rate of 121/3 feet per minute for 4.5 minutes. this depth is represented by the numerical expression:      -200 + 121 3 (4.5) simplify the expression using the order of operations. what is the diver’s depth?      -200 + 37 3 (4.5)     -200 + 55.5

−200+

37

3

(4.5)

=−200+55.5

=−144.5             You can use order of operations or pemdas to solve problems like this. Just remeber to go left to right and multiplaction can be before division and multiplacation can be before divison (same with subtaction and addition)

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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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