Answer:
[tex]\boxed{\bold{66k+9}}[/tex]
Explanation:
Expand [tex]\bold{5\left(10k+1\right): \ 50k+5}[/tex]
= [tex]\bold{50k+5+2\left(2+8k\right)}[/tex]
Expand [tex]\bold{2\left(2+8k\right): \ 4+16k}[/tex]
= [tex]\bold{50k+5+4+16k}[/tex]
Simplify [tex]\bold{50k+5+4+16k: \ 66k+9}[/tex]
= [tex]\bold{66k+9}[/tex]
Mordancy.
