Hello!
You can write this as an inequality
x is at least 5 which means x is equal to or greater than 5
[tex]5 \leq x[/tex]
x is at most 10 which means x is less than or equal to 10
[tex]x \leq 10[/tex]
Put these two together to get the answer
[tex]5 \leq x \leq 10[/tex]
Hope this helps!