9514 1404 393
Answer:
pool radius is 8+4√5 ≈ 16.94 meters
Step-by-step explanation:
Let r represent the radius of the pool. Then r+2 is the radius to the outside of the walkway. The ratio of areas is given as 4/5, so we have ...
πr²/(π(r+2)²) = 4/5
5r² = 4(r² +4r +4) . . . . cross-multiply
r² -16r -16 = 0 . . . . . . . subtract the right-side expression from both sides
__
r² -16r +64 = 80 . . . . . add 80 to complete the square
(r -8)² = 80
r -8 = √80 = 4√5 . . . . square root; use only the positive root
r = 8 +4√5 ≈ 16.94 . . . meters
The radius of the pool is 8+4√5 ≈ 16.94 meters.
_____
The area of a circle of radius r is given by the formula ...
A = πr²
You have to add a 1 underneath it so it's reciprocal is 1
1F=1/3Y
(1F)^2=(1/3Y)^2
F^2=1/9Y^2
------------------------
13F x 22F = 286F^2
-------------------------
286F^2 = 286 x 1/9 x Y^2
286F^2 = 286/9 Y^2
-------------------------
286/9 x $19.50 = $619.67
------------------------
Answer:
$619.67
Ans=D
dkdnndndndndnxbdndndn
law<span> states that </span>energy<span> cannot be created nor destroyed but it </span>can<span> only be transferred from one form to another form. (</span>Coal<span> - Fuel) Chemical </span>energy<span> is converted into heat </span>energy<span> during combustion. With the help of heat generated, the water is converted into steam.</span>
