Find the length x
Plz help ASAP

If tan2a=cot(a+60), find the value of a, where 2a is an acute angle

Ineed with question three. i don't understand how i'm supposed to achieve 3 marks.

Megan is making bracelets to sell to earn money for the local animal shelter. it takes her 1/4 hour to pick out all the beads and 1/10 hour to string them.this week, she only has 5 1/4 hours to make bracelets. how many bracelets will megan be able to make?