What is the value of number 7 in number 506,087

98 point question what is the record for most points in one

Karen will divide her garden into equal parts. she will plant corn in 8/12 of the garden. what is the lowest number of parts she can divide her garden into?

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.