Directions: Select all the correct situations in the table. Which situations represent a sum of rational numbers?
Situation 1
For an experiment, Stephanie heated
a cup of water raising its temperature
86.1 degrees. Then, she poured ice
into the cup lowering the
temperature 56.4 degrees.
Situation 3
Situation 2
Priscilla's house is 412 feet below
sea level. The elevation of Gisella's
house is of the elevation of
Priscilla's house
Situation 4
Bethany is scuba diving at a depth
of 95 3 feet. She separates her
ascent back to the surface into
3 sections
Jerimiah ran and burned
341.2 calories. Then, he ate breakfast
which was 376.8 calories.

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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64087235609746097215074621039754021037