Module quiz 7.3 question 2 and 3

Hi everyone,

I found hard to understand the correction for the question 2&3 from the module quiz of 7.3 predicting dependent variables and functional forms.
For question 2 why they mention 1% level of significance instead of 5% as its the case in the question?
For question 3 the predicted value equals 0.0023+1.1163*0.05 my question is from where they get “0.05” ?

Thanks in advance for your help.