<span>a + 6 for a = 10.
so
10 + 6 = 16
answer
</span><span>b)16</span>
Part A
P = perimeter of square
P = add up the four sides
P = N+N+N+N
P = 4*N
where N is the side length of the square
The perimeter of the square is at most 22 ft, which means 22 ft is the largest the perimeter can be. Think of it as the ceiling.
So P = 22 or P < 22. We can combine those two ideas to get
![P \le 22](https://tex.z-dn.net/?f=P%20%5Cle%2022)
(P is less than or equal to 22)
Replace P with 4N and solve for N
![P \le 22](https://tex.z-dn.net/?f=P%20%5Cle%2022)
![\frac{4N}{4} \le \frac{22}{4}](https://tex.z-dn.net/?f=%5Cfrac%7B4N%7D%7B4%7D%20%5Cle%20%5Cfrac%7B22%7D%7B4%7D)
divide both sides by 4
![N \le \frac{11}{2}](https://tex.z-dn.net/?f=N%20%5Cle%20%5Cfrac%7B11%7D%7B2%7D)
![N \le 5.5](https://tex.z-dn.net/?f=N%20%5Cle%205.5)
The side length N can be 5.5 ft or smaller
-----------------------------------------------------------------------------------------------
Part B
The result we got from part A above was
![N \le 5.5](https://tex.z-dn.net/?f=N%20%5Cle%205.5)
which means N can be equal to 5.5 or it can be smaller than 5.5
So this describes N = 2.5, N = 4.8, and N = 5.2
The values N = 5.8 and N = 6 are too big
So the answers to part B are 2.5 ft, 4.8 ft, and 5.2 ft
It's more than 75% because if she knows it that's 75% already, then you add 20% of the 25% she didn't know.
That's .20 • .25 = 0.05 or 5%.
She actually has an 80% chance.
<span>Then 0.80 • 40</span>