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**Answer:**

The cubic regression that fits the points , , and is .

**Step-by-step explanation:**

A cubic polynomial is a polynomial that has the following form:

**(1)**

Where:

- Independent variable, dimensionless.

- Dependent variable, dimensionless.

, , , - Coefficients, dimensionless.

We construct the following system of equations to determine the coefficients of the cubic regression:

**(1)**

**(2)**

**(3)**

**(4)**

The solution of the system of linear equations is:

, , ,

The cubic regression that fits the points , , and is .

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