What is the missing statement in step 4?
ZACE - ZBCD
ZEAB – ZDBC
LEAC = LEAC
CBD = DBC

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.

Anyone? 15m is what percent of 60m; 3m; 30m; 1.5 km?

1yd 1 ft = 1 1/12 1 1/3 1 1/2 1 1/6