How to solve this proof problem

"E ( x ; - * ) 2 s ( Yi- Y)e 4) (20 points, 4 points for each piece.) Compare the following two regressions: E( Yi- Y ) E( xi* )? | R ECTi-YEE ( xi i . Y , = Bo + B , X , te , - Yxy ii . Y , = Bo + B , ( 3 X , ) + 8 , Equation i. is exactly the regression we've been working with thus far, so all the formulas we've derived thus far apply immediately. In equation ii all the values of the independent variable in the sample have been multiplied by 4. How does this change, if at all, the values of B, Bo, SST, and r2? For the sake of clarity, please denote the OLS values for equation ii with a *, and compare them to the "regular" OLS estimates we derived in class