Answer:
r(8)=1.5
Step-by-step explanation:
The given function is [tex]f(x)=2x+5[/tex]
when f(x)=8, we have [tex]8=2x+5[/tex]
This implies that:
[tex]8-5=2x[/tex]
[tex]3=2x[/tex]
[tex]x=1.5[/tex]
Hence the point (1.5,8) lies on f(x)
The inverse of function r(x) will have the corresponding point (8,1.5)
This means that:
[tex]r(8)=1.5[/tex]
