This is what the question says:

12) students were asked to write a formula for the
length of a rectangle by using the formula for its
perimeter, p = 21 + 2w. three of their responses
are shown below.
1.1 = {p – aw
ii. 1 = {(p – w)
iii. 1 = p2w
which responses are correct?
a) i and ii, only
b) ii and iii, only
c) i and iii, only
d) i, ii, and iii

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

sas (side angle side)

aa (angle angle)

sss(side side side)

sas find two sides with an angle in between

aa is finding two angles and the third will add up to 180

sss find all sides

step-by-step explanation:

answer: (3,11) is your answer.