Penny attaches a weight of 2.5 pounds to a spring and it stretches 18 inches how far will the spring stretch for a weight of 6.4 pounds, assuming the rate of stretch per unit of weight stays constant?

i really dont know

step-by-step explanation:

depending on others is critical to survival. my source is apex!

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