Maxine works at an amusement park. she recorded the number of ice cream cones sold each day, along with the high temperature in fahrenheit degrees. usinger her data, she wrote a linear regression equation of y=9x-487. if the temperature, or, x, is 85f how many ice cream cones could maxine expect to sell?

278

Step-by-step explanation:

y = 9(85)-487

y = 765-487

y = 278

if the eqn of the parabola is f(x) = (x-4)(x+2), we need to mult. this out to find the coordinates of the vertex.

then f(x) = x^2 + 2x - 4x - 8, and f(x) = x^2 - 2x - 8.

one way in which you can find the vertex is to calculate x = -b / (2a).   here, that comes to

        )

x = = 1.   f(1) = 1^2 - 2(1) - 8 = - 9.   vertex is at (1, -9).

        2(1) 

find another point on the curve:   let x=0, for which y=-8.   then (0, -8) is on the curve.   plot the vertex and this point and draw a smooth parabola thru both.

hope this