Atmospheric pressure = 101,325 Newtons / m²
Weight per meter square = 101,325 Newtons
Mass per meter square = 101,325 / (9.81 x 1000)
Mass per meter square = 10.3 tonnes per m²
The 2 rooms only add up to 45,000 square feet (150 x 150 x 2) and the larger room is only 40,000 square feet (200 x 200) so this only gives you 85,000 square feet (40,000 + 45,000) which is not enough for the 100,000.
Hey there!
-4.36 + 1.2 [2.8 +(-3.51)]
= -4.36 + 1.2(2.8 - 3.51)
= 4.36 1.2(-0.71)
= -4.36 - 0.852
= -5.212
Therefore, your answer is: -5.212
Good luck on your assignment and enjoy your day!
~Amphitrite1040:)