Practice 13 1. Find (6+ 3n). a. What is the first term of this sum? b. What is the 13th term of the sum? c. If we write the sum both forwards and backwards and pair the terms vertically, what is the identical sum for each pair? d. Finally, give the sum of the first 13 terms. 27 2. Find (6n – 10). a. What is the first term of this sum? b. What is the last term of the sum? c. If we write the sum both forwards and backwards and pair the terms vertically, what is the identical sum for each pair? d. Finally, give the sum of the first 27 terms.

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