Question

A. Find the sum 3+8+13+...+28 B.  Find the first term and the common difference of the arithmetic...

A. Find the sum 3+8+13+...+28

B.  Find the first term and the common difference of the arithmetic sequence whose 7th term is 55 and 15th term is 37

C. An auditorium has 56 rows of seats. The first row contains 50 seats. As you move to the rear of the auditorium, each row has 7 more seats than the previous row.
How many seats are in row 21?
How many seats are in the auditorium?

D. Express the following sum in closed form.

∑k=1n (5+3⋅(k/n))^2

E.

Express the following sum in closed form.

∑k=1n (3+2k)^2

Math   Advanced-Math   
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