Graphing Quadratic Functions y=- Parent Function y=x² y=2x² y= x²+3 y=x² y=x²-2 y=4x²-1 y=x² y=0.5x²+3 What do you notice or wonder?

Sketch the graph of each quadratic function and compare it with the graph of y=x2. af(x)=14x2bg(x)=16x2ch(x)=52x2dk(x)=4x2

Traffic Accidents The following table shows the cost C of traffic accidents. in cents per vehicle-mile, as a function of vehicular speed s, in miles per hour, for commercial vehicles driving at night on urban streets. Speed s 20 25 30 35 40 45 50 Cost C 1.3 0.4 0.1 0.3 0.9 2.2 5.8 The rate of vehicular involvement in traffic accidents per vehicle-mile can be modeled as a quadratic function of vehicular speed s, and the cost per vehicular involvement is roughly a linear function of s, so we expect that C the product of these two functions can be modeled as a cubic function of s. a. Use regression to find a cubic model for the data. Keep two decimal places for the regression parameters written in scientific notation. b. Calculate C(42) and explain what your answer means in practical terms. c. At what speed is the cost of traffic accidents for commercial vehicles driving at night on urban streets at a minimum? Consider speeds between 20 and 50 miles per hour.

Write the quadratic function in standard form. Determine the vertex and axes intercepts and graph the function. f(x)=x2+2x8

The graph shows a quadratic function of the form P(t)=at2+bt+c which represents the yearly profit for a company, where P(t) is the profit in year t . (a) Is the value of a positive, negative, or zero? Explain. (b) Write an expression in terms of a and b that represents the year t when the company made the least profit. (c) The company made the same yearly profits in 2008 and 2016. Estimate the year in which the company made the least profit.

Write the standard form of the quadratic function whose graph is a parabola with vertex (4,11) and that passes through the point (6,15).

Alligators Refer to Exercise 93. If an alligator weighs 125 pounds, what is its approximate length? Round to the nearest inch. 93. Alligators The length in inches and weight in pounds of 25 alligators is shown in the table. Find the quadratic function that best fits the data. Round a,b, and c to six decimal places. Use the regression function to estimate the weight of an alligator that is 130 inches long. Round the weight to the nearest pound. Length Weight Length Weight Length Weight 94 130 72 38 90 106 74 51 128 366 89 84 147 640 85 84 68 39 58 28 82 80 76 42 86 80 86 83 114 197 94 110 88 70 90 102 63 33 72 61 78 57 86 90 74 54 69 36 61 44

Find the vertex of the graph of the quadratic function f(x)=2(x+5)24.

Graph: 3x+2y6.