Exam Maths Puzzle Co-ordinate geometry

How do I state the axis of symmetry for
y = 9x^2 + 6x - 1

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Exam Other Question

The base of a triangle is five feet longer than the height. The area of the triangle is 75 square feet. Find the height and base of the triangle. 1. let f be a quadratic function with a minimum value of -22100, a line of symmetry of x = 140, and a y-intercept of (0,-2500).
2. the function g is the same as f but reflected about the x-axis and reduced by a factor of 200.
3. if x equals your grade
What is the value of g to one decimal place?