To calculate : The number of pieces of chalk in the pile if the bottom row has 15 pieces of chalk and the top row has 6 pieces of chalk. Each row has one less piece of chalk than the row below it as shown in the figure below.
The number of pieces of chalk in the pile is
Given information :
The bottom row has 15 pieces of chalk and the top row has 6 pieces of chalk. Each row has one less piece of chalk than the row below it as shown in the figure below.
Formula used :
The
The sum of first
Calculation :
It can be observed that the bottom row has 15 pieces of chalk that is
The top row has 6 chalks that is
As each row has one less piece of chalk than the row below, so
Substitute all the values into the formula
Substitute the desired values in the formula
Thus, the number of pieces of chalk in the pile is
Chapter 7 Solutions
Holt Mcdougal Larson Algebra 2: Student Edition 2012
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