
Concept explainers
a.
To find the total membership money of the Ski club after recruiting 10, 15 and n new members.
a.

Answer to Problem 7P
The total membership money after recruiting 10, 15 and
Explanation of Solution
Given information:
Currently, the number of members in the club is 20. The dues per member are
Here,
After recruiting 10 new members, total number of members in the club
Total dues reduced after recruiting 10 new members
After reducing
Now, the total membership money
After recruiting 15 new members, total number of members in the club
Total dues reduced after recruiting 15 new members
After reducing
Now, the total membership money
After recruiting
Total dues reduced after recruiting
After reducing
Now, the total membership money
Hence,
The total membership money after recruiting 10, 15 and
b.
To find the value of
b.

Answer to Problem 7P
The total membership money of the club will be maximum, when the number of new members is 30.
Explanation of Solution
Given information:
Currently, the number of members in the club is 20. The dues per member are
The standard form of a
So, the formula of the axis of symmetry:
Let, the total membership money after recruiting
Now, comparing it with the standard form of the quadratic equation:
By applying the formula of the axis of symmetry:
Here,
Hence,
The total membership money of the club will be maximum, when the number of new members is 30.
Chapter 7 Solutions
Algebra and Trigonometry: Structure and Method, Book 2
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