Answer:
Grow up man, this is completely based on your curriculum, we would need your book to answer, and this has to be done by you.
The text does not specify whether the resistance R of the wire must be kept the same or not: here I assume R must be kept the same.
The relationship between the resistance and the resistivity of a wire is

where

is the resistivity
A is the cross-sectional area
R is the resistance
L is the wire length
the cross-sectional area is given by

where r is the radius of the wire. Substituting in the previous equation ,we find

For the new wire, the length L is kept the same (L'=L) while the radius is doubled (r'=2r), so the new resistivity is

Therefore, the new resistivity must be 4 times the original one.
The answer is: (2) : <span>↘
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Answer:A compound is a substance formed when two or more elements are chemically joined.
Explation:Water, salt, and sugar are examples of compounds.
I hope this helps<3