I will just tell me what you need
Answer:
Absolute error 
% Error 
5
Explanation:
The absolute error is the the difference in the measured value and the actual value of a quantity.
Here the actual value is 
grams
The measured value is 
grams
Absolute error
Percent error
Where AE stands for absolute error and AV stands for absolute value.
%
Answer:
There are 5 significant digits in 0.23100.
Explanation:
This is because all non-zero digits are considered significant and zeros after decimal points are considered significant.
Answer:
(c)-He separates the larger pebbles and other debris from the finer sand by sifting it with wire mesh.
Explanation:
A mixture is an association of substances that not react between them. It can be homogeneous when it's not possible to see the substances, or heterogeneous when it's possible to see each the substances.
Randy separates the substances of the soil with a wire mesh, so it's possible to define the substances, then the mixture is heterogeneous.
