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superscript 63 and subscript 152 Eu (the super and subscript go before the symbol with superscript on top of the subscript)
You should expect to review a good deal of what you learned in Grade-7 math, and then go quite a bit farther ... somewhat past the point where Grade-9 math will begin.
Its a general state requirement to do 3 years of math (geometry included) in order to go to graduate and to go to a 4 year university
Order of operation means that you go from the left of your equation to the right always doing multiplication and division first and then addition and subtraction
I think you are referring to checking a math equation. After you solve an equation you should go back and check your work to make sure you got the right answer. You can do this by plugging your answer back into the equation