4tina pet sits to earn extra money. she charges a flat service fee of $20, plus $20 per day. if one of her customers spent less than $180, which of the following inequalities could be used to solve for x, the number of days the customer paid for pet sitting?

Let x represent the number of days 

20+ 20x< 180               ( to find the answer solve for x)

20+ 20x <180    ( subtract 20 from both sides)
20x < 160          ( divide each side by 20 to get x alone)
x< 8 
Tina pet sat for less than 8 days

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