A man purchased a magazine at the airport for $ 2.79 . The tax on the purchase was $ 0.12 .What
is the tax rate at the​ airport? Round to the nearest percent.

4%

Step-by-step explanation:

Tax rate=(0. 12)/(2.79)*100=4%

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

one set of data has more variation than the other. hope this !