We have the following:
We can raise the following inequality
[tex]3+1.2x\ge13.5[/tex]x is the number of tasks, now solving for x,
[tex]\begin{gathered} 3+1.2x\ge13.5 \\ 1.2x\ge13.5-3 \\ x\ge\frac{10.5}{1.2} \\ x\ge\frac{35}{4} \\ x\ge8.75 \end{gathered}[/tex]Therefore the set of solutions would be
[tex]\lbrack8.75,\infty)[/tex]