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http://mathbitsnotebook.com/JuniorMath/RatioProportion/RPProportions.html Arithmetic Series and Sums https://mathbitsnotebook.com/Algebra2/Sequences/SSGauss.html https://www.mathsisfun.com/algebra/sequences-sums-arithmetic.html https://www.mathsisfun.com/algebra/sequences-sums-geometric.html#:~:text=1%2C%202%2C%204%2C%208,the%20previous%20term%20by%202. Exercises: Six years ago, I was 6 years old. Six year form now on, I will be ? years old? 2021 –