I need help. please, I do not understand much​

Solve for x, y, and z. show all steps.

Suzanne began a trip with 18 1/2 gallons of gas in the gas tank of her car if she hughes 17 3/4 gallons on the trip how many gallons does she have left once she finish the trip

Rewrite the following quadratic functions in intercept or factored form. show your work. y = 9 + 12x + 4x^2