Describe the key features of the graph of the quadratic function f(x) = -5x2 + 5. a. does the parabola open up or down? b. is the vertex a minimum or a maximum? c. identify the axis of symmetry, vertex and the y-intercept of the parabola.

The boiling point of water at an elevation of 0 feet is 212 degrees fahrenheit (°f). for every 1,000 feet of increase in elevation, the boiling point of water decreases by about 2°f. which of the following represents this relationship if b is the boiling point of water at an elevation of e thousand feet? a) e = 2b - 212 b) b = 2e - 212 c) e = -2b + 212 d) b = -2e + 212