A teacher wants to form a linear regression equation to predict a student's score based on the final based on the number of hours they spent studying for it. Final scores are in percents. y = 2x + 60 R2 = 0.65 a. According to the equation how many hours would a student have to study to have a grade of 90%. b. What does the slope mean in terms of the situation? c. What does the y-intercept mean in terms of the situation? d. What does the coefficient of determination mean in terms of the situation?