Simplify 4cd + 6d + 9c - 4cd​

Aiden buys two bags of chips at $1.09 each and a 20 ounce soda for $1.20 at the gas station.he knows that the state tax is 5.5. how much change will he receive from a $5 bill?

∆red ≅ ∆ by rule will give brainiest if possible

Which steps could be part of the process in algebraically solving the system of equations, y+5x=x^2+10 and y=4x-10