- A13
- B12
- C11
- D24
Step-by-Step Solution
a = 60, d = -4, an = 16. 16 = 60 + (n-1)(-4) gives -44 = -4(n-1), n-1 = 11, n = 12.
Answer: B) 12
A contractor lays bricks for a wall. Each course (row) needs 4 fewer bricks than the one below it.
The bottom course needs 60 bricks and the top course needs 16 bricks.
How many courses does the wall have?
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