can someone explain to me step by step how to solve 7 , 8 and 9 pls guys i actually wanna learn for my final LOL anyways pls teach me

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.

The length of the line segment ac is 8x-9 what is the value of x

Suppose m: angle a =77 degrees what is the measure of a complement of a complement of angle a, what is a conclusion you can draw about a complement of a complement of an angle