Zach bought a car for $45,000. In three years its value decreased to $25,000. What is the percent of decrease? Round to the nearest whole percent.

idk

step-by-step explanation:

idk

step-by-step explanation:

what grade level is this? need to know so i can look in my old textbooks!

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