Explain whether or not you think each relationship is linear.

1.the cost of equal priced dvd's and the number purchased
2.the height of a person and the person's age
3.the area of a square quilt and its side length
4.the number of miles to the next service station and the number of kilometers

it would take 7/10 of an hour too fill the pool.

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