Pls help Rami buys 3 pounds of oranges. If the total cost is represented by c what is the cost per pound? (Write in the problem-solving steps below.)
Partl: Define the variable (call it c).

Part II: Write a one-sentence description of the problem.

Part III: Write an algebraic expression describing the cost per pound.

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?