Please help me with this problem I been stuck in this problem for 45 min and don't know how to go about it ????

4. In a study of the stability of IQ scores, a large group of individuals is tested once at age 18 and again at age 35. At age 18, the average score was 100, with SD of 20. At age 35, the average score was 100, with SD of 10. The correlation coefficient is 0.7. Find the regression equation for predicting the IQ score at 35 based on the IQ score at 18. Estimate the average score at 35 for all individuals who scored 120 at 18. For the people that scored 120 at 18, what percentage scored more than 130 at 35