Maths-Problem with Umbrellas,Cold Problems

Today we did a lot of maths wich was fun because maths is my favourite subject. It took me 2 days but in the end I finished and i'm happy with what I've done. Although I have my questions here, I also have a link on the Google Doc that you're about to see and it also has all the questions on it to. I hope you like my work. Here's the link. Questions and Answers.