Do you know the format? With the number next to the box, and the division number in the box? Because if you write 17 to the left, and 2397 to the right, that is how you write it. If you don't know how to divide it, I would suggest Khan Academy.
Ok so Candy draws a square design with a side length of x inches for the window at the pet shop. She takes the design to the printer and asks for a sign that has an area of
16x^2-40x+25square inches.
Let y(x) =16x^2-40x+25
If differentiating both sides w.r.t x we get
y'(x)=32x-40
And
to find critical point x ,Put y'(x)=0 then
32x-40=0
x=5/4
1000-200=800
So he needs $800 /2= needs to sell 400 tickets
<span>2cos^2x = sin2x
2cos^2x = 2sin x cos x
(2sin x cos x) / (2cos^2x) = 1
sin x / cos x = 1
tan x = 1
x = π/4</span>
