I need the answer for B! whoever answers first will get a brainliest, a thanks, and 50 points! also plz tell me how you got the answer

I need the answer for B whoever answers first will get a brainliest a thanks and 50 points also plz tell me how you got the answer class=
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Here's your graph. The clubs both have a balance of $80 after 6 weeks.

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A graphing calculator is helpful.
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