21 11 2 35 then 2x 7 Estimate your answer to 1 decimal place 169 31 22 13 13 7 of the sequence 23 831 31 and are the first three terms of an arithmetic sequence what is the sum of the first 21 terms 1375 5 Mark s morning class scored an average of 89 25 points across 4 tests His evening class scored an average of 94 50 points across 4 tests What was the average test score between both classes across all 8 tests Estimate your answer to 2 decimal places 45 94