For Exercises 7–14, a . Determine whether the graph of the parabola opens upward or downward. b . Identify the vertex. c . Determine the x -intercept(s). d. Determine the y -intercept. e. Sketch the function. f. Determine the axis of symmetry. g. Determine the minimum or maximum value of the function. h. Write the domain and range in interval notation. ( See Example 1 ) p ( x ) = − 1 5 ( x + 4 ) 2 + 1
For Exercises 7–14, a . Determine whether the graph of the parabola opens upward or downward. b . Identify the vertex. c . Determine the x -intercept(s). d. Determine the y -intercept. e. Sketch the function. f. Determine the axis of symmetry. g. Determine the minimum or maximum value of the function. h. Write the domain and range in interval notation. ( See Example 1 ) p ( x ) = − 1 5 ( x + 4 ) 2 + 1
Solution Summary: The author explains that a quadratic function called p(x)=-15 left (x+4 )2+1 is called its vertex
The Mauna Loa Observatory in Hawaii records the carbon dioxide concentration y (in parts per million) in Earth’s atmosphere. The January readings for various years are shown in Figure . In the July 1990 issue of Scientific American, these data were used to predict the carbon dioxide level in Earth’s atmosphere in the year 2035, using the quadratic model y = 0.018t2 + 0.70t + 316.2 (Quadratic model for 1960–1990 data) where t = 0 represents 1960, as shown in Figure a. The data shown in figure b represent the years 1980 through 2014 and can be modeled by y = 0.014t2 + 0.66t + 320.3 (Quadratic model for 1980–2014) data where t = 0 represents 1960. What was the prediction given in the Scientific American article in 1990? Given the second model for 1980 through 2014, does this prediction for the year 2035 seem accurate?
A. Transform each function to vertex form.
1. y = x2 + 8x + 20
Marriage Rate The marriage rate per 1000 unmarried women for the years 1987–2014 is given by 132x + 1000y = 9570 where x is the number ofyears after 1980.a. Find the x-intercept of the graph of this function.
b. Find and interpret the y-intercept of the graph ofthis function.c. Graph this function, using the intercepts.(Source: National Vital Statistics Report)
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