PLEASE HELP ME

In the coordinate plan (-6,9) b (3,9) c (3,3) def is shown in the coordinate plan below

For each proportion find the unknown number x 1/5/8=×/15

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.