What is the sign of f on the interval -5/2 < x <4

Please help ASAP

What statement is true? 2x^2-9x+2=-1

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?

Which value of y will make the inequality y< -1 false?