I WILL MARK BRAINLIEST Jacy has a choice of cell phone plans. Plan A is to pay $260 for the phone plan and then
pay $70 per month. Plan B is to get the phone for free and pay $82 per month for service.
Determine an equation that represents each plan.

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?