1. if no digit may be used more than once, how many 5-digit numbers can be formed using only the digits 3,8,1,2,5and 7?
717 numbers
360 numbers
722 numbers
720 numbers

Using complete sentences, describe the central economic problem facing all humans. why does this require people to make choices? how can this result in opportunity costs?

What factors influenced brazil's current and future economic strength?

Technology has affected regional settlement patterns in what ways? choose all that apply. climatic improvement strategies have improved crop productivity. mechanized agricultural methods have improved agricultural productivity. participation in the global economy has increased urbanization. population shifts from urban to rural areas has increased as a result of petroleum production. settlement areas have increased as a result of improved water storage and delivery systems.