Acar company has found that there is a linear relationship between the money it spends on advertising and the number of cars it sells. when it spent 6 dollars on advertising, it sold 680 cars. moreover, for each additional 5000 dollars spent, they sold 40 more cars. let x be the amount money they spend on advertising, in thousands of dollars. find a formula for y, the number of cars sold.

The required formula for y, the number of cars sold is: .

Step-by-step explanation:

Consider the provided information.

Let x represents the amount of money spend on advertising .

y is number of cars sold,

For each additional 5000 dollars spent, they sold 40 more cars.

The y-intercept form is:

Substitute x=60,000, y=680 and m=0.008 in the above equation.

Thus, the required formula for y, the number of cars sold is: .

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