The sum of the sides of a triangle add up to 12 feet. if one side has a length of 3 feet and another side has a length of 4 feet, what is the length of the third side

Francis is getting new carpet tiles in his living room and den. his living room and den are connected. he needs to figure out how much carpet he needs and the cost involved. if each tile costs $2.00 per sq ft, how much would it cost to have new tile put in the den? a) $24 b) $36 c) $48 d) $54 plz awnser soon