-500
Explanation
Step 1
a function is a relation where a variable depends on the other, in this case, we have
[tex]y=-500+15x[/tex]
it means that the value for y depends on the value you put for x, then to find the missing value, just find f(0)
Step 1
[tex]\begin{gathered} f(0)=-500+15\cdot0 \\ f(0)=-500 \end{gathered}[/tex]
Hence, the answer is -500
