It is estimated the united states population will be 4.0 times 10^8 and the worlds population will be 8.0 times 10^9. About how many times greater will the world's population be than the united states population in 2030

a. she will receive a refund of $278.

step-by-step explanation:

the correct answer is 5 6 and 7

6.5

step-by-step explanation:

you said it was in the question

~courtney

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