What is the mystery number x? x has 3 digits. The tens digit is half the hundreds digits. The number is odd. The sum of the digits is 9. x = ___

X= 423

Step-by-step explanation:

This answer has 3 digits. The tens digit (2) is half of the hundreds (4). And 4+2+3=9. Also this number is odd

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