Sylvia needs at least $310 for a new audio system. she has already saved 120$. she earns 10$ per hour at her part time job. write and solve an inequality to find how many hours she will need to work to buy the system. interpret the solution.

310 = 120 + 10x

Step-by-step explanation:

310 represents the final number she needs to by the audio system

120 represents the money she has already saved

10 represents the amount of money she will earn in x amount of hours; multiplied by x

Example, if she worked 2 hours;

310 = 120 + 10(2)

310 = 140

She would have to work more obviously to meet the $310 criteria

option 3 . (5x + 1) - (-10x + 6)

step-by-step explanation:

option 1 :

(4x + 3) + (-9x + 4)

or 4x+3 -9x + 4

or -5x + 7

option 2

(x - 2) - (6x - 9)

or x-2-6x + 9

or -5x + 7

option 3

(5x+ + 6)

or 5x + 1 + 10x -6

or 15x -5

option 4

-4x+2x+7-3x

-7x + 2x + 7

-5x + 7

hence only option 3 did   not satisfy the given simplify expression.