Answer:
x = 8
Step-by-step explanation:
When cutting the wire we will get two pieces
x and 12 - x
If we build a circle whith x , the lenght of the circle will be x, and if we look at the equation for a lenght of a cicle 2*π*r = x
then r = x/2π
and consequentely A₁ = area of a circle = πr² A₁ = π*x/2π
A₁ = x/2
With the other piece 12 - x we have to make an square so wehave to divide that piece in four equal length
side of the square = s
s = 1/4 ( 12 - x ) and the area is A₂ = [1/4 ( 12 - x)]²
A₂ = ( 12 - x )²/16
Then A₁ + A₂ = A(t) and this area as fuction of x
A (x) = x/2 + 1/16 ( 144 + x² -24x) A (x) =[ (8x + 144 + x² -24x)]/16
Taken derivatives in both sides
A´(x) = 8 + 2x - 24 = 0
2x -16 = 0 x = 8 and s = 12 - 8 s = 4
Move all terms not containing x to the right side of the equation
x=9
We have to use Pythagorean theorem that says :
The missing length of the triangle is : 36 feet
Answer:
p = .7
Step-by-step explanation:
3(p+2.55)=9 3/4
Change the fraction to a decimal
3(p+2.55)=9.75
Divide each side by 3
3/3(p+2.55)=9.75/3
(p+2.55)=3.25
Subtract 2.55 from each side
(p+2.55-2.55)=3.25-2.55
p =.7
