Help me solve these questions. Thanks

You are considering the following two cars: if gasoline is $3.00/gallon and your interest rate is 8%, which car should you buy and why? there is a tax credit of $3, 000 for hybrid vehicles, what does the price of gasoline to make you indifferent on the choice of the two cars. I used the MSRP (keep in mind no one pays that) and mileage from Toyota. The insurance, maintenance and service life I picked. A project has the following cash flows. What is the internal rate of return for the following project? If the minimum attractive rate of return is 10%, is this a good project? x = -b plusminus Squareroot b^2 - 4 ac/2a for the equation ax^2 + bx + c = 0