Which statements describe the process of scientific inquiry?

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?

Which of the following countries has declared itself nuclear free

Nrectangle pqrs, pq = 18, ps = 14, and pr = 22.8. diagonals pr¯¯¯¯¯ and qs¯¯¯¯¯ intersect at point t. what is the length of tq¯¯¯¯¯? a.7b.9c.11.4d.22.8