The cost function is given by \( C = 1.25m + 25 \). To determine which points are on this line, we can substitute the values of \( m \) into the equation and see if the corresponding \( C \) values match the given points.
Let's evaluate the options one by one:
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For (4, 30): \[ C = 1.25(4) + 25 = 5 + 25 = 30 \] This point works.
For (8, 35): \[ C = 1.25(8) + 25 = 10 + 25 = 35 \] This point also works.
The points (4, 30) and (8, 35) are correct.
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For (30, 4): \[ C = 1.25(30) + 25 = 37.5 + 25 = 62.5 \] This point does not work.
For (35, 8): \[ C = 1.25(35) + 25 = 43.75 + 25 = 68.75 \] This point does not work.
The points (30, 4) and (35, 8) are incorrect.
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For (2, 22.5): \[ C = 1.25(2) + 25 = 2.5 + 25 = 27.5 \] This point does not work.
For (4, 20): \[ C = 1.25(4) + 25 = 5 + 25 = 30 \] This point also does not work.
The points (2, 22.5) and (4, 20) are incorrect.
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For (2, 2.5): \[ C = 1.25(2) + 25 = 2.5 + 25 = 27.5 \] This point does not work.
For (4, 5): \[ C = 1.25(4) + 25 = 5 + 25 = 30 \] This point does not work.
The points (2, 2.5) and (4, 5) are incorrect.
Conclusion:
The correct answer is (4, 30) and (8, 35).