Answer:
C or D
Explanation:
When we say a furnace is “sealed combustion,” it means it draws on air from outside the house to use for burning fuel (i.e. combusting fuel). ... It's closed-off and draws air through a plastic PVC pipe that connects it to the outside. A second pipe attached to the combustion chamber sends out the exhaust
Answer:
i would say opportunity cost
Explanation:
I DON'T KNOW ANYTHING REGARDING ECONOMICS SO DON'T TRUST ME 100% I WAS DRAWN BY TAE PFP
but it was an opportunity and value means cost??
