please help find the volume of the sphere and show work

Answer: V≈1436.76
[tex]V=\frac{4}{3} \pi r^3[/tex]
4/3×π=4.1887902047863909846168578443727
r=7
7^3=343
4.1887902047863909846168578443727×343=1,436.7550402417321077235822406198
1,436.7550402417321077235822406198=1436.76
I hope this is good enough: