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TThe 2 questions

 Mar 20, 2023
 #1
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uh, not even algebra

 Mar 20, 2023
 #2
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Somehow it does say it is

Guest Mar 20, 2023
 #3
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3 + 8 + 13 + ... + 293 + 298 + 303 is an arithmetic series with first term 3, common difference 5, and 63 terms, so its sum is (3 + 3 + 5*63*64)/2 = 10083.

 Mar 20, 2023

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