the expression 2(x²-4x-21) - (x+77) and (x-7) (x+k) are equivalent. what must be the value of k A.-148 B.-71 c.83 D.160​

Nwhat way does renewable energy differ from nonrenewable energy?

How does rain water cause erosion and deposition? a. when acidic water soaks into the ground, water dissolves limestone, resulting in the formation of caves. b. when a river overflows it moves downhill resulting in the formation of caves. c. when it rains, water flows into rivers and streams and moves back to land, resulting in the formation of caves. d. when water empties into lakes, sediment is deposited, resulting in formation of caves.

What is the lithosphere and describe its characteristics?