3. Write a function h(x) with no vertical asymptotes and with removable discontinuities at x= -2 and x= 6. Explain how to sketch the graph of the function h(x) without using a calculator.

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?