The sum of the measures of the interior angles in a polygon is 540 degrees. how many sides does the polygon have?

Plot the points (0,6), (3,15.8), and (9.5,0) using the graphing tool, and find the function

If f(x)=3x+1 and f^-1=x-1/3, then f^-1(7)=

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?