The given expression is
[tex](40s+100t)\div10[/tex]
We will use the distributive property to solve it
Divide each term in the bracket by 10
[tex]\frac{40s}{10}+\frac{100t}{10}[/tex]
Simplify each term
[tex]\begin{gathered} \frac{40s}{10}=4s \\ \\ \frac{100t}{10}=10t \\ \\ 4s+10t \end{gathered}[/tex]
The answer in standard form is 4s + 10t
