Найди значения выражений:a+b и a-b,если а=30100,b=20935,а=28005 и b=13706

Срочно, помогите пожалуйста!

 Замените подчеркнутые слова местоимениями:
Phrasal verds 
Fill in the from.- Fill it in.
Look through the documents.- Look through them.

0) He filled in the application 
He filled it in 

1) He looked through the job advertisements in newspapers.

2) He had to go into all his reasons for choosing this job.

3) He put in his applications together with the letters.

4) He's been looking out for a new job for six months.

5) He put on his best clothes.

6) He thought over his friend's suggestion.

7)He thought of his new image.

8) he made up a story about his childhood.

9)He found out some information on the website.