Hello can someone help me to answer this 4 questions, please answer all the questions because some people don't answer all the answer. Thank you

1. Give an example of a quadratic function that has only one real zero 2. Give an example of a quadratic function that has only two real zeros. 3. Give an example of a quadratic function that has no real zeros. 4. Application: Give a real-life example of a quadratic function and