What is greater -4 in a half or -7?

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.

With alll of except for the 2 that i did already

To decrease an amount by 16% what single multiplier would you use