Q1:  eyeball it .55
Q2: should be better than Q1 but not way better => .66
Q3:
> 2*51.814+ 96.2 + 197.007
[1] 396.835
Q4:
 4*61.53
[1] 246.12
Q5:
> 51.814-2*3.146
[1] 45.522
Q6: pvalue is 0, reject
Q7: confidence interval for dummy coefficient is well away from 0.