a. the equation represents the situation because Roberto payed $200 and the total cost of the recliner was 400, so Roberto pays it off $20 a month until Roberto pays the full $400
b. It will take Roberto 5 months to pay off the recliner.
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a. 3x+4=25
b. the number Hal was thinking of is 7; 3x+4-4=25-4; 3x/3=21/3; x=7
