I would GREATLY appreciate it if you could help me. (WORTH 20+ POINTS.) Joan went on a 3 day road trip to visit her best friend in North Carolina; she drove a total of 320.7 miles on the trip. The first day Joan drove 118.75 miles, on day two she drove 95.4 miles. How many miles must she have driven on the third day?

Part B: If Joan wanted to take a more scenic route home, her new total mileage would be 385.5 How many more miles is her trip home than her trip to North Carolina?

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?