Electrical engineering or computer engineering
Congratulation in exploring these two options! Your math skills will help you. You can start with either Electrical Engineering or Computer Science because the 1st two years would have pretty much the same courses. By the third year you would have a good idea on what you want to specialize in. Best of Luck!
I have a bachelors degree in electrical engineering. That is the classic discipline involving circuit analysis, power creation and conversion, and design. In my opinion, if you want a career at one of the big tech companies, you are better off getting into computer engineering or computer science.