Answer:
(x-1990)×25
Step-by-step explanation:
SEE THE IMAGE FOR SOLUTION
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-b/2a is the equation to find the x coordinate of the vertex point and it's y, when x is plugged into the quadratic equation.
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Answer: 1.64
80% = 50
20% = 12.5
100% = 62.5
38% = 1.64