The 1st one would be written in word form as three tenths two hundredths six thousands
Second is three hundred twenty- six thousandths, in percentage form as 32.6%, or as a fraction as 326/1000 or, as a fraction in simplest form, 163/500.
Since we know that the volume of a sphere is 4/3 the volume of a cylinder, we can multiply 21*4/3. 21*4 will equal 84 and 84/3 would be 28. So the volume of the sphere would be 28 meters cubed.
