kaiglerboy
contestada

The cost for a certain music plan is 9.99 per year plus $.025 per song you download if you paid $113.74 one year find the number of songs downloaded

Respuesta :

y=amount of money paid.  (in $)
x=number of songs download.

We have this function:
y=0.25x+9.99

Then:
if y=113.74

113.74=0.25x+9.99
0.25x=113.74-9.99
0.25x=103.75
x=103.75 / 0.25
x=415

Answer: the number of songs downloaded would be 415.
salimsalvin
try to make a function

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