Match the vocabulary word to its correct definition. 1. element a collection or group of objects indicated by braces, { } 2. null set a set containing no elements; also called the empty set 3. set a member of a set 4. subset set a is a subset of set b if all of the elements of set a are contained in set b or it is the empty set

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?

For the inequality |c| < |d| to be true, which of the following must be true?

Find the condition that the zeros of the polynomial f(x) = x^3+3px^2+3px+r may be in a. p.