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I need help. ASAP. PLEASE.

Ok, so I got this formula from another answer and want someone to help me in explaining how they got to this formula. I understand where they got the constant from, where they got the a-value, but I don't understand where they got b = 2. Please help. We're dealing with a quadratic function here, in which the rate of change is generally -0.2. Thank you to anyone who responds.

I need help. ASAP. PLEASE. Ok, so I got this formula from another answer and want-example-1
User Mi Po
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You haven’t supplied enough information to help you. The original question would have helped.
User Elyana
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