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Math·Algebra·Linear functions

hard

A museum exhibit displays 73 artifacts on day 1. On each following day, 3 artifacts are added to the exhibit. The function $f(x)=3(x-1)+73$ represents this situation, where $f(x)$ is the total number of artifacts exhibited at the end of day $x$. According to the function, what is the number of artifacts that have been added to the exhibit by the end of day $x$?

A

73

B

3x

C

3x + 73

D

3(x - 1)