The 9th terms of an AP are 50 and 65 find the common difference and the sum of an it's first 70 terms

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I would , had you proofread your question so it can be done

Did you know?

Did you know that in an arithmetic progression (AP), the common difference is the constant value by which each term increases or decreases? In this case, if the 9th term is 50 and the 10th term is 65, we can calculate the common difference. By subtracting the 9th term (50) from the 10th term (65), we find that the common difference is 15. Moreover, did you know that the sum of the first n terms in an arithmetic progression can be calculated using the formula: Sn = (n/2)(a + L), where Sn represents the sum, n is the number of terms, a is the first term, and L is the last term? In this scenario, we are interested in finding the sum of the first 70 terms. With the known information of the first term (a = 50) and the common difference (d = 15), we can apply the formula to determine the sum of the first 70 terms in this arithmetic progression.