When 9 times a number is increased by 30 the answer is the same when 140 is decreased by the number find the number

The unknown number = 11

Step-by-step explanation:

Let

The unknown number = x

9 times a number is increased by 30

= 9x + 30

140 is decreased by the number

= 140 - x

9x + 30 = 140 - x

Collect like terms

9x + x = 140 - 30

10x = 110

x = 110 / 10

x = 11

Check:

9x + 30

9(11) + 30

= 99 + 30

= 129

140 - x

= 140 - 11

= 129

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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answers

rauschg

rauschg · hand

know the answer? add it here!

step-by-step explanation:

-8/2y-8=5/y+4-7y+8/y^2-16

we move all terms to the left:

-8/2y-8-(5/y+4-7y+8/y^2-16)=0

we can not solve this equation