0/1Select all of the true statements about residuals. Residuals are calculated by finding the difference between the actual y-value and the predicted y-value. Residuals should either be all positive or all negative. Residuals plots determine if a function is a good fit. The sum of the residuals should always be zero because the predicted values should be that close to the actual values. When the best fit line for a set of data is quadratic, the residual will have no distinct pattern.