m a − t h e a r i t m e t hi c a v er a g e m a = 3 5 + 3 + 4 = 3 12 m a = 4 s
The average weekly change in running time is found by adding the improvements over three weeks (5, 3, and 4 seconds), which totals 12 seconds. Dividing this total by the number of weeks (3), gives an average change of 4 seconds. So, the average weekly change in running time is 4 seconds.
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Pasangan isobar adalah suatu atom ketika memiliki nomor massa sama, tetapi nomor atom/unsur berbeda. Misalnya 24 12 Mg dan 24 13 Al. Jadi kalau di tabel periodik, nomor atom terletak dibawah, sedangkan nomor massa terletak diatas, semoga membantu #cmiiw