Which best explains whether 9 is a solution to the inequality x > 9?
It is not a solution because 9 is not greater than 9.
It is not a solution because 9 is not less than 9.
It is a solution because 9 is greater than 9.
It is a solution because 9 is less than 9.

In the xy-plane, if the parabola with equation passes through the point (-1, -1), which of the following must be true?

You are at a restaurant and owe $38 for your meal. you want to leave a 20% tip. how much will your tip be?

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?