NH3-N is not a formula. It is an expression of Ammonia lab testing.
10 mg/L NH3-N means there are 10 mg/L Nitrogen in sample solution due to NH3.
In water, you can find NO3-N, NO2-N, NH4-N, etc. With the same definition as above, i believe you know what the meaning of them all.
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300.03 - 300.07 amu
It depends on which compound interest formula you mean. Refer to the Wikipedia Article on "Compound Interest" for the correct terminology.
The Nth term formula for oblong numbers is N = N(N+1)
the formula for the unshaded area is n=3*x