Complete the pattern below by counting the number of matches used in each pattern. How many of matches are there in pattern number 6?

Find the missing terms in the arithmetic sequence: ___, ___, ___, 8, 12, 16.

A conference hall has 33 rows of seats. The last row contains 80 seats. If each row has two fewer than the row behind, how many seats are there in the first row?

If three arithmetic means are inserted between -15 and 9, find the first of these arithmetic means.

Which term of of an arithmetic sequence 5, 9, 13, 17, ..., 401?

Find p so that p + 7, 3p + 9, p + 3, ..., form an arithmetic sequence.

In the library, the books are arranged in shelves. 12 books in the first row, 18 books in the second row, 24 books in the third row and so on in the same increasing pattern. If the shelves have 6 rows, how many books are there in the shelves?

The number of seats in the first 14 rows of the center orchestra aisle of the UMAK Mini-Theater in Makati City form an arithmetic sequence as shown. How many seats in total are in the first 14 rows?

Find the sum of the terms of the given sequence 3, 7, 11, 15, 19, 23, ..., 123, 127.

Find the sum of the terms of the given sequence -4, -6, -8, -10, -12, -14, -16, -18, -20, -22, -24, -26, -28, -30.

Find the sum of the terms of the given sequence 34, 30, 26, 22, 18, 14, 10, 6, 2, -2, -6, -10, -14, -18, -22, -26.

Find three arithmetic means given the first term 7, and last term 43.

If three arithmetic means are inserted between

If five arithmetic means are to be inserted between  $\frac{1}{2}$  and  $\frac{7}{2}$  , then what is the third arithmetic mean?