Which number comes next in the pattern 121, 109, 99, 91, __

85

From 121 to 109, it subtracted 12.

From 109 to 99, it subtracted 10.

From 99 to 91, it subtracted 8.

As you can see, the pattern is subtracting two less than the time before.

So for the next number you would do: 91-6= 85

85 is the correct answer, sorry I have to type 20 characters

step-by-step explanation:

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