Can someone me with #11 and i'll mark you if you with the entire box

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.

Ihonestly have no clue if it's each or none.

Solve the equation.then check your solution 8=1.88+a