Help me please. These are my last two problems

9. 2ab =30

10.Ans;

Step-by-step explanation:

9. Ans;

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10. Ans;

I hope I helped you^_^

it will cost dollar $540

the living room is 3 which means if we divide 325/3 then we get $108

therefore if 1part of the living room cost $108 and 3 costed $325

then total 5part of the room will cost 5*108 which gives $540