Can someone please assist me with showing me how to calculate a regression equation r and r2 for the following data?

Actual scores:                 100                         65                          120                        58

Forecast scores:             105                        65                          135                        65

Using the actual scores for Weeks 1, 2, 3, and 4 and your forecast values, calculate a regression equation, r, and R²for this data.

1. What data did you use in your regression equation? Which is the independent and dependent variable?

2. What is the regression equation, r, and R² for your data?

3. Statistically, what does r and R² tell you?

4. Based on your empirical evidence, how who well did you forecast your results? Justify your response.