No clue how to do this one, pls help "A base of the right solid has an area of 45 ft^2. The height of the right solid it 10 ft. Find the volume of the right solid."

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.