Answer:
Both model building codes and NFPA 220 can be used to determine the type of construction used in a building.
Answer:
when 5% excess air is supplied, moles of air supplied/moles of fuel = 
Explanation:
Equivalence ratio = 0.6
Equivalence ratio = Actual air to fuel ratio (AAFR)/ stoichiometric air to fuel ratio SAFR
combustion reaction of propane is

From above reaction, 1 mole of propane, from the reaction, 5 moles of oxygen required,
we know that air contains 21% O_2 and 79% N_2,
Therefore, moles of air based on stoichiometry 
Theoretical air to fuel ratio 
Given
Actual Air Fuel Ratio 
when 5% excess air is supplied, moles of air supplied/moles of fuel = 
I believe it’s A bit I. could be wrong
A coping saw is also called a Bow saw because of it's shape.
Answer: Forward So it's D