Question 7 asks about alpha value. Is this question dependent on question 6 where it is mentioned to set alpha (alphas=np.logspace(-3, 3, num=101)) ? Is the questions asking about what alpha values we get if we use np.logspace(-3, 3, num=101) ?
Question 7 asks to check the parameter alpha_. Remember from the Set and get hyperparameters notebook that the underscore at the end refers to a particular value for a hyperparameter found during fit.
What you need to do to answer this question is quite similar to what is done on the Regularization of linear regression model notebook 
Thank you!