The students want to find a cooler that keeps the temperature inside the cooler more than 3 degrees below the freezing point of water (0ᵒC) after 90 minutes. Indicate which of the tested coolers meets this goal, and explain why.

no not all of them.

step-by-step explanation:

some of them have a square base.

you didn't give me the choices, so i will just give you the graph so you can look at your choices and choose the right one.

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