Concept explainers
a.
To calculate: The Numbers of the bricks are in the 12th row.
a.
Answer to Problem 9P
The numbers of bricks are in 12th row is 19.
Explanation of Solution
Given information: The numbers of bricks are in last row = 85
The numbers of bricks are in second last row = 79
The numbers of bricks are in third last row = 73
Since,
Hence, the above series are in A.P
The first term,
Second terms,
The common difference,
Formula used:
Now, 12th term
Calculation:
Hence, the 12th term is 19.
b.
To calculate: The total numbers of rows.
b.
Answer to Problem 9P
Total numbers of rows are
Explanation of Solution
Given information: The numbers of bricks are in last row = 85
The numbers of bricks are in second last row = 79
The numbers of bricks are in third last row = 73
The numbers of bricks are in top most = 1
Since,
Hence, the above series are in A.P
The first term,
Second terms,
Last term,
The common difference,
Formula used:
Calculation:
Hence, the total numbers of rows are
Chapter 11 Solutions
Algebra and Trigonometry: Structure and Method, Book 2
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