Ithink of a number, then divide by 5, then subtract 78 -the result is nine
what number was i thinking of first

algebra is really hard for me i start to stress about it a lot

Imagine that the number that we are looking for is x

We know that:

x/5 - 78 = 9

x/5         = 9 + 78

x/5         = 87

x             = 87 . 5 = 435

So the number we need is 435

step-by-step explanation:

this is not a question

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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