Answer:
Composite panel garage doors
Explanation:
Answer:
All the time and to see if someone is behind you.
Explanation:
After you check your side mirrors you should check your review mirror to see who is behind you.
Answer:
1.3cm
Explanation:
the arrow is 3 lines past the 1 so it is 1.3cm
Answer:

Explanation:
For pressure gage we can determine this by saying:
The closed tank with oil and air has a pressure of P₁ and the pressure of oil at a certain height in the U-tube on mercury is p₁gh₁. The pressure of mercury on the air in pressure gauge is p₂gh₂. The pressure of the gage is P₂.

We want to work out P₁-P₂: Heights aren't given so we can solve it in terms of height: assuming h₁=h₂=h
