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Sketching Graphs of Quadratic Functions In Exercises 9-12, sketch the graph of each quadratic function and compare it with the graph of
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EBK COLLEGE ALGEBRA
- In Exercises 27-34, use a graphing utility to graph the quadratic function. Identify the vertex, axis of symmetry, and x-intercept(s). Then check your results algebraically by writing the quadratic function in standard form. f(x)=x2+10x+14arrow_forwardIn Exercises 9-14, match the polynomial function with its graph. [The graphs are labeled (a), (b), (c), (d), (e), and (f).] f(x)=2x25xarrow_forwardFill in the blanks. When the graph of a quadratic function opens downward, its leading coefficient is and the vertex of the graph is a .arrow_forward
- In Exercises 57-62, find two quadratic functions, one that opens upward and one that opens downward, whose graphs have the given x-intercepts (There are many correct answers.) (5,0),(5,0)arrow_forwardIn Exercises 13-26, write the quadratic function in standard form and sketch its graph. Identify the vertex, axis of symmetry, and x-intercept(s). g(x)=x28xarrow_forwardHeight of a basketball The path of a basketball thrown from the free throw line can be modeled by the quadratic function f(x)=0.06x2+1.5x+6, where x is the horizontal distance in feet from the free throw line and f(x) is the height in feet of the ball. Find the maximum height of the basketball.arrow_forward
- 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.arrow_forwardPlease do fastarrow_forward(A) Use a graphing utility to find the quadratic function of best fit that models the relation between age and median income. The quadratic function of best fit is y = [ ] x^2 + [ ] x - [ ] (d) Use the function in part (b) to predict the peak income earned. The predicted peak income is about $ [ ] (Round to the nearest dollar as needed.)arrow_forward
- (a) Find a quadratic function whose x-intercepts are - 3 and1 with a = 1; a = 2; a = - 2; a = 5.(b) How does the value of a affect the intercepts?(c) How does the value of a affect the axis of symmetry?(d) How does the value of a affect the vertex?(e) Compare the x-coordinate of the vertex with themidpoint of the x-intercepts. What might you conclude?arrow_forwardThe rate growth G, in thousands of dollars per year, in sales of a certain product is a function of the current sales level s, in thousands of dollars, and the model uses a quadratic function: G=1.2s-0.3s² The model is valid up to a sales level of 4 thousand dollars. A: Express using functional notation the rate of growth in sales at a sales level of 2.260 thousand dollars, and then estimate that value. B: At what sales level is the rate of growth in sales maximized? Aarrow_forward
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