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PLZ HELP ASAP can someone help me on 10 and 13 also show the work plz!!

PLZ HELP ASAP can someone help me on 10 and 13 also show the work plz!! class=

Verified Answer :

  1. 4.5(x+3)<45
          4.5x+13.5<45
          4.5x<31.5
          x<31.5/4.5
          x<7

    13. a)  750+6x>1170(subtract 1170-750)
            6x>420(divide 420/6)
         x>70
     
         b.) 750+6x<900(subtract 900-750)
              6x<900(divide 900/6)
             x<900/6
      x<26
        
    c) 750+8x=weekly expense(cannot solve)

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