Answer:
Sean pays $73 to the scout club for 12 patches that he had earned in a month.Explanation:
The given function: Amount Sean pays to the scout for x earned patches.
f(x) = 4.50x + 19
x = number patches earned in a month
Amount Sean pays to the scout for 12 earned patches can be calculted by:

So, Sean pays $73 to the scout club for 12 patches that he had earned in a month.