A gallery is using glass display cases to display artifacts. They need to cover each display case with a sheet of clear protective film to protect the glass on every side. This net represents a single display case. How much film is needed to cover each display case?

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in²

The amount of film that needs to cover the display case is its surface area

2420 square inches of film is needed to cover each display case

The dimension of the case is given as:

26 in by 15 in by 20 in

Start by calculating the surface area of the case using:

So, we have:

Evaluate the product

Hence, 2420 square inches of film is needed to cover each display case

Read more about surface areas at:

answer: hence, function will be

explanation:

since we have given that

cost of a new textbook = $85

according to question, the resale value of a textbook decreases by 25% with each previous owner,

so, our function becomes,

here, y is the total value of the text book after x owners.

hence, function will be