PlS HELP ME AND DONT GIVE ME NONSENSE ANSWERS PLSS THANKS

A helium tank from a party store carries 50 cubic feet of helium.

Each balloon has a radius of 0.5 feet.

Approximately how many spherical balloons can the tank fill?
a.25
b.100
c.50
d.75

Amayoral candidate would like to know her residents’ views on a tax on sugar drinks before the mayoral debates. she asks one thousand registered voters from both parties. these voters are an example of a census population convenience sample simple random sample