The robotics club is selling shirts for a fundraiser. They have purchased a box of shirts for $400 at $5 per shirt. To promote their fundraiser, they have also spent $60 on advertising. Which equation can the club use to calculate the selling price per shirt if they want to make a profit of $300? Select all that apply.

400x=5x+360
80x-460=300
80x+300=460
400x-60=300
80x=760
5x=300
2000x=360
400/5x=300

Each person in an it department of 25 people works on at least one of 3 major projects: system security, program implementation, platform development. 10 people work on system security, 13 work on program implementation, and 12 work on platform development. 4 people work on system security and platform development, 5 people work on program implementation and platform development, and 2 people work on all three projects. how many people work on system security and program implementation?