(NOT LINKS)George takes a photograph of a rectangular window that is 3 1/2 feet tall and 1 3/4 feet wide. He prints the photograph on paper so that the image of the window is 1/2 foot tall and 1/4 foot wide. What is the ratio of the area of the window to the area of the image of the window? A. 1:49
B. 1:7
C. 7:1
D. 49:1​

b

2

−

b

b

3

+

7

b

2

+

14

b

+

6

%

−

3

b

3

+

7

b

2

+

14

b

+

6

%

step-by-step explanation:

answer: 204

step-by-step explanation:

we are told that the revenue is

x⋅(4080−10x)=−10x^2+4080x

this is a quadratic function, so to maximize it we should find the x-value of its vertex. recall that the x-value of the vertex of the parabola ax^2+bx+c is given by the formula −b/2a.

so in this case, we have a=−10 and b=4080, so the x-value of the vertex is

−b/2a= −(4080)/2(−10)=204