When iris subtract -), she got a difference of -24 is her answer correct? if not what mistake did she make?

Find x & pleeeeaaaassseeee 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.

What is an alternate exterior angle