Answer:
-89
Step-by-step explanation:
Given that ,
[tex]\implies f(x) = -5x + 0.7 [/tex]
Substitute [tex] f = 18 [/tex] in above function ,
[tex]\implies f(18)= -5(18)+0.7 \\\\\implies f(18)= -90+0.7 \\\\\implies \underline{\boxed{ f(18) = -89.3\approx -89 }}[/tex]
