Well, you could get the mass as

ad then

, where

is the sea level weight,

the sea level accel.,

the accel. above while

the weight above.
Answer:
The 1st and 2nd ones on the top
Explanation:
Hope this helps:)
It is soluble in water and slightly soluble in ethanol.
D all are 1 because the left side equals the right
Answer: keep a current from passing out of the wire
Explanation: plastic is an insulator and will not conduct electricity