I'm new and looking for help please.

I have to calculate R^2 (R-squared) using a calculator and haven't been given the Explained Sum of Squares (ESS). Is there a way to do this?

I have been given:

Residual Sum of Squares 16.31

Standard deviation of outcome variable y 3.25

Correlation of predictor variables x and z -0.042

25 data points

Thank you