1) A brick wall has 60 bricks in the bottom row but each row has 3 fewer bricks than the previous one. How many bricks are in the 12th row?
2) If you have an arithmetic sequence, the first number is 2 and the common difference is 4, what is the 4th number in the sequence?
3) The next term in arithmetic series 3, 4.5, 6, 7.5 is?