We have to write the expression in mathematical terms.
If we have a number x, then "nine more than six times the number" is equivalent to:
[tex]9+6x[/tex]We know that is equal to 39 so we write and solve for x as:
[tex]\begin{gathered} 9+6x=39 \\ 6x=39-9 \\ 6x=30 \\ x=\frac{30}{6} \\ x=5 \end{gathered}[/tex]Answer: x = 5 [Option a]