What best describes why carbon is a useful building block. Carbon has 2 electrons in its outer shell and can form strong ionic bonds to build
solid structures
Carbon has 4 electrons in its outer shell and can form covalent bonds to build a
variety of structures
Carbon has 8 electrons in its outer shell and is a very stable atom

Carbon has 4 electrons in its outer shell and can form covalent bonds to build a variety of structures

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y=250x+2000

Step-by-step explanation:

The farmer starts with 2000 trees and adds 250 each year.

Year 0   2000

Year 1   2000 + 250 = 2000+ 1(250)

Year 2   2000 + 250 +250 = 2000 + 2(250)

Year 3   2000 + 250 + 250 + 250 = 2000 + 3(250)

Year 4   2000 + 250 + 250 + 250 + 250 = 2000 + 4 (250)

Year X   2000 + 250x