A queen-sized mattress is 20 inches longer than it is wide. A king-sized mattress is 16 inches wider than the queen-sized mattress but has the same length. The area
of the king-sized mattress is 1,280 square inches more than that of the queen-sized
mattress.
Write an equation that can be used to determine the area of the king-sized mattress.
Define all variables used.

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step-by-step explanation:

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