Question

semester 1: unit 4 exam review
4.
function ( c ) gives the cost, in dollars, of downloading ( n ) songs.
which statement best describes ( c(5) = 7.50 )?
a. it costs $5 to download 7.5 songs.
b. it costs $7.50 to download 5 songs.
c. five songs were downloaded in $7.50 hours.
d. the cost increases by $7.50 for each song.
a
b
c
d

Explanation:

In the function \(C(n)\), \(n\) represents the number of songs downloaded, and \(C(n)\) represents the corresponding cost in dollars. So \(C(5) = 7.50\) means when 5 songs are downloaded, the cost is $7.50. Option A swaps the input and output values, Option C incorrectly introduces time (hours) which is not part of the function, and Option D describes a rate of change which this function value does not represent.

Answer:

B. It costs $7.50 to download 5 songs.