Concepts of algebra 1 10.1-10.3 review

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.

Two angles are complementary. the large angle is 36 more than the smaller angle. what is the measure of the large angle?

Mat bought a phone for $100. he has to pay $30 per mouth. if he has paid $640 in total, how many mouth has he had the phone?