Thornton Township High School is a public high school of the Thornton Twp Hsd 205 School District located in Harvey, IL. It has 1,802 students in grades 9th through 12th. Thornton Township High School is the 116th largest public high school in Illinois and the 2,072nd largest nationally.
Sum of the First n Terms of a Sequence. The sum of the terms of a sequence is called a series. If a sequence is arithmetic or geometric there are formulas to find the sum of the first n terms, denoted Sn, without actually adding all of the terms.um of the First n Terms of a Sequence. The sum of the terms of a sequence is called a series. If a sequence is arithmetic or geometric there are formulas to find the sum of the first n terms, denoted Sn, without actually adding all of the terms.
Following this pattern, the n-th term an will have the form an = a + (n  1)d. For geometric sequences, the common ratio is r, and the first term a1 is often referred to simply as a. Since you get the next term by multiplying by the common ratio, the value of a2 is just ar. The third term is a3 = r(ar) = ar2. The fourth term is a4 = r(ar2) = ar3. Following this pattern, the n-th term an will have the form an = ar(n  1). Find the tenth term and the n-th term of the following sequence: