Answer:

Step-by-step explanation:
To solve this problem we need to be familiar with the formula for the surface area of a cone:

We are given the length of a side and the diameter, to calculate the radius divide the diameter in half:

To calculate the height of the cone, we must use the Pythagorean Theorem:

We can treat the side length as the hypotenuse
, the radius as the base
, and solve for height
. Set the expression up like this:

Now we can plug into our original formula:

Width=w
length=(40-2w)/2=20-w
A=w(40-w)
A=40w-w²
A'=40-2w=0
2w=40
w=20
20x20 is the size of the pen having the greatest area. this tells us the largest rectangle for a given perimeter is a square
Answer:
option A
Step-by-step explanation:

Answer:
y=x+2
Step-by-step explanation:
Isolate y to get the slope.
x-y=-2
move x by subtracting from both sides to get:
-y=-2-x
Make -y positive by multiplying both sides by -1:
y=2+x
Reorder the problem:
y=x+2
Answer: sin=32/40=4/5, cos=24/40=3/5, tan=32/24=4/3
Step-by-step explanation: