The volume of a cylinder is given by:
[tex]V=\pi\cdot r^2\cdot h[/tex]Where:
V = Volume = 141 cm³
h = Height
r = radius = 3cm
π = 3.14
Therefore:
[tex]\begin{gathered} 141=3.14\cdot(3^2)\cdot h \\ 141=28.26h \end{gathered}[/tex]Solve for h:
[tex]\begin{gathered} h=\frac{141}{28.26} \\ 5.0\operatorname{cm} \end{gathered}[/tex]