Is 10 a natural number

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There are 45 questions on your math exam. you answered 810 of them correctly. how many questions did you answer correctly?

The sum of the first eight terms of an arithmetic progression is 9m + 14. the fifth term of the06 progression is 2m - 6, where m is a constant.given that the first term of the progression is 26,find the value of the common difference, d and thevalue of m.