Answer:

Step-by-step explanation:
Fixed monthly fee = $20
Amount charged per minute for long distance calls = $0.20
denotes total cost such that
minutes are used for long distance calls.
Amount charged for
minutes for long distance calls 
Therefore, an equation for the total cost, C, when N minutes are used for long distance calls is 
4 times 7 = 28
3 times 7 = 21
It will take him 21 days to make 28 bird houses.
The surface area of the box in square inches will be 39.0625 inches².
<h3>How to calculate the area?</h3>
From the information, the gift box has a surface area of 6.25 square feet.
Therefore, the surface area of the box in square inches will be:
= Side × Side
= 6.25 × 6.25
= 39.0625 inches²
Therefore, the surface area of the box will be 39.0625 inches².
Learn more about area on:
brainly.com/question/25292087
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Answer:
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Step-by-step explanation:
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