You estimate that the length of your classroom is 23 feet. The actual length of the classroom is 21 feet. Find the percent error. Round your answer to the nearest whole percent.

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.