Answer:
Ello, estoy aquí para ayudar, pero hablo español, con suerte, entenderás que lo estoy intentando.
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Step-by-step explanation:
Answer:
75.44 Square Inches
Step-by-step explanation:
The diagram of the problem is produced and attached.
To determine the area of the cleaned sector:
Let the radius of the larger sector be R
Let the radius of the smaller sector be r
Area of the larger sector 
Area of the smaller sector 
Area of shaded part =Area of the larger sector-Area of the smaller sector

From the diagram, R=10 Inch, r=10-7=3 Inch, 
Therefore, Area of the sector cleaned

First you need to find out how much he spends each session which would be___?
The answer is f(x)‐¹=(+/-)x+25+5