What are the solutions to the equation |x| =15 -4x?
a - the valid solution is x = 3, and the extraneous solution is x = 5.
b - the valid solution is x = 5, and the extraneous solution is x = 3.
c - the two extraneous solutions are x = 3 and x = 5.
d - the two valid solutions are x = 3 and x = 5.

answer: it's a

step-by-step explanation:

a. is correct

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

answer: 80,000

step-by-step explanation:

the population doubles every day.

10,000*2=20,000 day 4

20,000*2=40,000 day 5

40,000*2=80,000 day 6