Estimate the sum. use benchmarks with decimal parts of 0, 0.25, 0.50, or 0.75.
2.52+4.03
a. 6.50
b. 6.75
c. 7

a

step-by-step explanation:

rurbrbrjrnrbjr

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