reycaden
02.12.2019 •
Mathematics
David did not have time to wait for the elevator on the first floor of the building so he decided to go up the stairs. if it took him 2 minutes to get to the third floor, how long will it take him to get to the ninth floor?
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Ответ:
8 minutes
Step-by-step explanation:
It takes 2 minutes every 2 floors, and Floor 9 is 8 floors away from Floor 1, so 2x4=8.
Ответ:
A=20,000 m2 per year
Step-by-step explanation:
we have that Volume (V) =300,000 m3, so V=A*h, where A=area (m2) and h=15m
V=A*h ⇒ 300,000m3=A*15m ⇒ A=300,000m3/15m ⇒ A=20,000 m2