How important is it for a country to protect its border? Why?

Why does a tidal bulge occurs on opposote sides of earth

Equilateral triangle pbj is inscribed in a circle as shown. determine the measure of arc pjb.

Rescooperate ice cream shop recently analyzed their books. they found that in the past year, they made 100000 selling ice cream and spent 75000 on supplies and factory space. the remaining 25000 represents