Each year, the number of students taught by Mr. Wright increases by 2 The first year, he taught 18 students. The total number of students taught after 25 years can be represented using the expression the sum from n is equal to 1 to 25 of open bracket 18 plus 2 close bracket How many students has Mr. Wright taught in 25 years?
The yearly numbers form an arithmetic sequence: 18 students in year 1, increasing by 2 each year. In year 25, he teaches 18 + 24 × 2 = 66 students. The total is 25 × (18 + 66) ÷ 2 = 1,050, so the answer is 1,050 students.
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