The fourth grade students at harvest school make up 0.3 of all students at the school . what fraction is equivalent to 0.3

What is best way to getting answer for my exam is

Inez has a phone card. the graph shows the number of minutes that remain on her phone card a certain number of days.

The circumference of a redwood tree trunk is 20π ft, and it is 100 ft tall. what is the approximate volume of the redwood tree trunk? 1,000π ft3 10,000π ft3 4,000π ft3 40,000π ft3