Using complete sentences, describe the two types of changes that national boundaries experience on a regular basis. Provide an example of each.

5×^2+20-15 or -(5x^2-20+15)

A

Your answer is d. silli hope this ! : ) i left an explanation down below if you need it: a sill forms when hot magma squeezes between layers of rock to form a hardened sheet of rock. a sill is basically a tabular sheet intrusion between old layers of sedimentary rock, volcanic beds, or in the direction of foliation inherent in metamorphic rock. the word sill means a concordant intrusive sheet.