If 12 cookies cost $3, how much would I pay for 5 cookies? Set up a proportion and solve. $1.00

B.
$1.25

C.
$1.50

D.
$1.75

B) 1.25

Step-by-step explanation:

$3/12 cookies = $.25/cookie

.25 * 5 = 1.25

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