Zachary adds 26.64 g to 12.557 g. How many significant figures should his answer have? two
three
four
five

This answer should have four signifigant features

Explanation:

I had this on a test and got it right  :D

if two electrons have the same n, the same ℓ, and the same ml, then they are in the same orbital. the pauli exclusion principle states that no two identical fermions (a fancy word for electrons and other subatomic particles like electrons) may occupy the same quantum state in an atom simultaneously.

what is the general relationship between a galaxy's distance from earth and its speed?

the answer is:

the farther away a galaxy is from us, the faster it is moving away from us.