Oscar raises $69.75 because $23.25 multiplied by 3 equals $69.75.
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The required proportional value of the f(x) is given as -75 when x = 15.
proportionality is defined as between two or more sets of values, and how these values are related to each other in the sense are they directlyproportional or inverselyproportional to each other.
Here,
As
f(x) ∝ x
So
f(x₁) / f(x₂) = x₁ / x₂
Substitute the values in the above equation,
50 / f(x₂) = -10 / 15
f(x₂) = -75
Thus, the required value of the f(x) is given as -75 when x = 15.
Learn more about proportionality here: brainly.com/question/22620356
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