Can some help me pleas I don’t know

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. !

You have 6 dollars +12 pennies +to quarters + 4 dimes=2 nickels how much do you have

What is sin 7x/4 ? i need on this urgent trig