i answered the first part i just need help in the part b. Please

A regression was run to determine if there is a relationship between hours of TV watched per day (x) and number of situps a person can do (y). The results of the regression were: y^=bx+ab=1.241a=20.469R2=0.786769 a) Use this to predict the number of situps a person who watches 13 hours of TV can do (to 3 decimal places) b) What is the value of the correlation coefficient (to 3 decimal places)