At his son's birth, a man invested $2,000 in savings at 6% for his son's college education. approximately how long will it take for the man’s investment to double?

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.