Answer:
9
√
2
Step-by-step explanation:
1. Rewrite 162 as
⋅2
2. factor 81 out of 162

3. Rewrite 81 as 

4. Pull the terms from under the radical
![\sqrt[9]{2}](https://tex.z-dn.net/?f=%5Csqrt%5B9%5D%7B2%7D)
I hope this helps :)
the answer will be 20 times 3 that is 60
20 is the area
And 18 is the perimeter
11.
(87+91+86+x)/4=90.
x=96.
13.
50×y > 130.
the lowest number could be 3, because 50×2=120, which is less than 130.