Those who have guts and really think themselves math kings/queens , solve it

What is the value of r of the geometric series?

The angle of a triangle are given as 6x,(x-3), and (3x+7). find x then find the measures of the angles

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.