An MP3 player costs $70 and song downloads cost $0.85 each. How do you write an expression that represents the cost of the MP3 player and x number of downloaded songs. Then find the total cost if 20 songs are downloaded?

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An MP3 player costs $70 and song downloads cost $0.85 each. How do you write an expression that represents the cost of the MP3 player and x number of downloaded songs. Then find the total cost if 20 songs are downloaded?

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Answer 1 · 2017-01-13T14:14:10

The expression is

#70+0.85n#

For #n=20# this works out to #$87$

Explanation:

The $70 cost of the mp3 player is a fixed expense. We do not need a variable to express it.

The amount spent on music downloads depends on the number of songs we buy, so we use a variable to represent this number, and multiply that variable by the cost of each song.

Add the two terms, and you have the total cost.

Answer 2 · 2017-01-13T14:14:14

See the solution process below:

Explanation:

The expression for the Total Cost of Ownership for this MP3 player is:

#M = p + cx# Where:

#M# is the Total Cost of Ownership for the MP3 player.
#p# is the cost to buy the MP3 player - $70 in this case
#c# is the cost of a CD - $0.85 in this case
#x# is the number of CDs purchased - 20 for the problem we are asked to solve.

Substituting gives:

#M = $70 + ($0.85 xx 20)#

#M = $70 + $17#

#M = $87#

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An MP3 player costs $70 and song downloads cost $0.85 each. How do you write an expression that represents the cost of the MP3 player and x number of downloaded songs. Then find the total cost if 20 songs are downloaded?

2 Answers

Explanation:

Explanation:

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