Chapter 3 - Quadratic Functions - Review Exercises and Problems for Chapter Three - Page 130: 24

i) Vertex: $(0,-7)$ ii) Axis of symmetry: $x= 0$ iii) $x= 0$, $y$-intercept: $y=-0.3(0)^2-7=-7$ iv) Concave down.

Give $y=-0.3 x^2-7$ i) Vertex: $(0,-7)$ ii) Axis of symmetry: $x= 0$ iii) $x= 0$, $y$-intercept: $y=-0.3(0)^2-7=-7$ iv) Since the coefficient $a$ is negative the curve is concave down.