Find the value of x that makes m parallel to n

According to modern science, earth is about 4.5 billion years old and written human history extends back about 10,000 years. suppose the entire history of earth is represented with a 10-meter-long timeline, with the birth of earth on one end and today at the other end.

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

Find the greatest common factor of the followig monomials 46g^2h and 34g^6h^6