Pls me with 12 and the bottom one (show work for ) + lots of !

Well, since its isoceles triangle so two equal sides. its either 3 or 7. There is a theorem that states two sides added must be greater than the third. so if the third side is 3. it would be 3+3=6, less than 7, incorrect. therefore the correct side is 7. so the sides are 3, 7, 7. you can add them to confirm the theorem.

If cheese is $4.40 per kilogram, you should pay .88