I need help answering these questions

#8 1. Maria's new car costs $280 per month for car payments and insurance. She estimates that gas and maintenance cost 15 cents per mile. a) Express her total monthly cost as a function of the miles driven during the month. b) What is the slope of the graph of the cost function? 2. Find the vertex a) y = x* - 2x -7b) y = x' + 4x +9 c) y = 4x - 8x + 2 3.Write the equation of parabola If the x- intercept is 2 and -1 and y-intercept is 6. 4.Write the equation of parabola if the vertex is (4,8) and passing through the origin 5. Write the equation of parabola if the minimum value of x is f(3) = -8 and f(1) = 2