The equation I DONT understand is the first one on top. X + 3 5/6 = 8

Add the two expressions 3.8b - 7 and 2.9b + 9 enter your answer in simplified form

Which system of linear inequalities is represented by the graph?

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?