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find the missing length x in these keloids cuboids given their surface area. Plz tell me how you did it too. i realy need help.

find the missing length x in these keloids cuboids given their surface area Plz tell me how you did it too i realy need help class=

Respuesta :

surface area =2*(3*x)+2*(1*x)+2*(3*1)=6x+2x+6=8x+6
70=8x+6
64=8x
x=8
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