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Mathematics, 27.06.2021 14:00 dp845095

I need help. ASAP. 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.

Ok, so I got this formula from another answer and want someone to help me in e

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