20x3 would 60
Just mutiply the number fishes with 3
Area of circle = πr²
Given that area = 153.86 m², find the radius:
153.86 = πr²
r² = 153.86 ÷ π
r² = 48.98
r = √48.98
r = 7 m
Diameter = Radius x 2 = 7 x 2 = 14 m
Answer: Diameter = 14 m
The answer to the questions of volumes are given as follows
a) 
b) 
c)
d)
Generally, the questions are mathematically solved below

a) x-axis
if $y=4, x=16, x=0$
Using disk method




b) line y=4
if x=0, y=0 ;

Using shell method


![v=2 \pi\left[\frac{4 y^{3}}{3}-\frac{y^{4}}{4}\right]_{0}^{4} \\](https://tex.z-dn.net/?f=v%3D2%20%5Cpi%5Cleft%5B%5Cfrac%7B4%20y%5E%7B3%7D%7D%7B3%7D-%5Cfrac%7By%5E%7B4%7D%7D%7B4%7D%5Cright%5D_%7B0%7D%5E%7B4%7D%20%5C%5C)
![v=\frac{2 \pi}{12}[1024-768] \\](https://tex.z-dn.net/?f=v%3D%5Cfrac%7B2%20%5Cpi%7D%7B12%7D%5B1024-768%5D%20%5C%5C)


c) y-axis
0 ≤ y ≤ 4
x=y^2
Using disk method
volume



d) line x=-1
y=√x, y=4, x=0
0 ≤ x ≤ 6
Using shell method
volume is


![V=2 \pi\left[\frac{x^{3 / 2}}{3 / 2}+\frac{x^{5 / 2}}{5 / 2}\right]_{0}^{16} \\](https://tex.z-dn.net/?f=V%3D2%20%5Cpi%5Cleft%5B%5Cfrac%7Bx%5E%7B3%20%2F%202%7D%7D%7B3%20%2F%202%7D%2B%5Cfrac%7Bx%5E%7B5%20%2F%202%7D%7D%7B5%20%2F%202%7D%5Cright%5D_%7B0%7D%5E%7B16%7D%20%5C%5C)
![V=2 \pi\left[2 / 3 \cdot\left(4^{2}\right)^{3 / 2}+2 / 5\left(4^{2}\right)^{5 / 2}\right] \\](https://tex.z-dn.net/?f=V%3D2%20%5Cpi%5Cleft%5B2%20%2F%203%20%5Ccdot%5Cleft%284%5E%7B2%7D%5Cright%29%5E%7B3%20%2F%202%7D%2B2%20%2F%205%5Cleft%284%5E%7B2%7D%5Cright%29%5E%7B5%20%2F%202%7D%5Cright%5D%20%5C%5C)





Read more about volumes
brainly.com/question/1578538
#SPJ1
Answer: 7
Explanation: plus 8 to 34 so you have
42 = 6d and then divide 42 by six and 6d divided by 6 too you get 7 = d