### Instruction: Consider the function $f(x)=5x+4$.  What is $f(1)$?### Response: To find $f(1)$, I need to plug in $x=1$ into the function definition and simplify.
So I get $f(1)=5(1)+4$.
Multiplying 5 and 1 gives 5, so I can rewrite this as $f(1)=5+4$.
Adding 5 and 4 gives 9, so I have $f(1)=9$.