Which equation represents the function described by this table? f(x)=x+3 f(x)=x−3 f(x)=−3x f(x)=3x x y
-7 -21
-5 -15
4 12
9 27
please help

If x=-3 is the only x-intercept of the graph of a quadratic equation, which statement best discribes the discriminant of the equation?

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?

The candy store is having a 30% off sale. emma is going to buy $7.50 worth of candy.how much will she pay after the discount