If A={3,7, H,11,15} and B={−1,2,3,5,7,11,13,17}, then what is n(A∪B)?

This is the number of parts out of 100, the numerator of a fraction where the denominator is 100. submit

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.

Ineed to know the answer to this algebra question.