Analyze the key features of the graph of the quadratic function f(x) = -x2 + 2x + 10. 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.

In a coastal town, the humidity, measured in grams of water per kilogram of air, increases by 43% for every 1 degree celsius increase in temperature. a scientist observes that the humidity on monday morning is 5.75 grams per kilogram. he wants to know how much the temperature must increase for the humidity to reach at least 49.17 grams per kilogram. let t represent the increase in temperature, in degrees celsius, from monday morning's observation. write an inequality to represent the situation, and use it to determine the desired temperature increase.