Help!! I got 15 as an answer but I don't know.

Do not comment if you aren’t going to . create a real-life situation and create a system and show how it might be modeled algebraically with a system of equations (or inequalities) show all work include a few sentences explaining the situation, your variables of choice and what each represents, and how you would set it up and solve it algebraically. !

Select the lengths in centimeters that would form a right triangle

Which word in the sentence below is an interrogative pronoun? who is picking us up from school? whousisfrom