Plz can anyone calculate this equation for me. I dont have a Calculator

Thank you so much

Plz give the right answer!

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.

How to simply and write the answer n a whole number

If t8 = 4 and t12 = −2, find the first three terms of the arithmetic sequence.