Which sentence tells about a goal that has already been achieved? janelle wants to be the team captain. janelle has become the team captain. on and off the field, janelle behaves like a team captain. with her skills, janelle is sure to be the team captain.

The sentence which tells about a goal that has already been achieved is the following one:

Janelle has become the team captain.

Explanation:

The fact its verb tense is Present Perfect explains it, since it is used to talk about things that are relevant to the present in some way. It is also used to talk about a person's "curriculum vitae", professionally or personally-wise, that is, a person's overall achievements in life. The other alternatives are about wishes, that is, things that are desired but have not been achieved yet.

the reason some people sacrifice their own life for another person's life could be that they are in love with them and would do anything to keep them safe a protected even if that means risking their life in the process

substitute y = 2x - 4 to x + 2y = 12:

x + 2(2x - 4) = 12     use distributive property

x + (2)(2x) + () = 12

x + 4x - 8 = 12     add 8 to both sides

5x = 20     divide both sides by 5

x = 4

put the value of x to the first equation:

y = 2(4) - 4

y = 8 - 4

y = 4