Well...........thanks for posting anyway.
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Since your multiplying by the same number, 104, both terms, you can group them like this:
104(1.26+2.50)
104(3.76)
391.04
Knowing that scientific notation needs to be a number x, that’s greater or equal to 1, and less then 10.
3.9104 * 10^2
They are important because they are the electrons that help the atom to bond with another atom. They are in the outer most shell. ☺️
A lunar eclipse occurs when The moon’s orbit is tilted five degrees from earth’s orbit around the sun .