Afather is now three times as old as his son. twelve years ago he was six times as old as his son. how old are the son and father now

Stages 1 and 4 of the demographic transition are similar in that

Solve for r in the formula v = ir, when i = 5 and v = 15.

Read the article titled "trans-saharan migration routes to north africa and the eu: historical roots and current trends." why do tens of thousands of sub-saharan africans try to cross the mediterranean each year? how are these refugees commonly portrayed? (site 1)