Find the value of x and YZ. XY = 5x, YZ = x, and XZ = 30

What structure on the south african coast has a range of 63 km and releases flashes every 30 seconds?

The caste system in india was used for what purpose? a) to ensure that all people had an adequate income b) to prevent the rich from taking too much power c) to provide social control and conformity according to one’s birth d) to draft a military capable of defending india from mongol invasion

Which of the following groups did not invade northern europe? ottomans celts vikings romans (i believe that it is either ottomans or celts)