P = 2(L + W)
P = 36
36 = 2(L + W)
36/2 = L + W
18 = L + W....L = 18 - W
A = L * W
A = 65
L = 18 - W
65 = W(18 - W)
65 = 18W - W^2
W^2 - 18W + 65 = 0
(W - 13)(W - 5) = 0
W - 13 = 0 .....L = 18 - 13
W = 13 L = 5
W - 5 = 0 L = 18 - 5
W = 5 L = 13
Not exactly sure which (length or width)...but one is 13 ft and the other is 5 ft
By taking in mind the number of combinations of 4 out of the 7 dishes, and the possible orders of these 4 dishes, we will find that there are 840 unique ways to arrange 4 of the 7 dishes.
We know that if we have a set of N elements, the total number of different combinations of K elements (K ≤ N) out of the N elements is given by:

In this particular case, we have:
- N = number of available dishes = 7
- K = number that we need to select = 4
Then the number of different combinations is given by:

Now we have 4 dishes selected, but we also need to order them.
- For the first dish, there are 4 options.
- For the second, there are 3 options (as one was already selected).
- For the third, there are 2 options.
- For the last one there is only one option.
The number of different arrangements of the dishes is given by the product between the numbers of options above, this gives:
4*3*2*1 = 24
Then the total number of unique ways of arranging 4 of the 7 dishes is:
C = 24*35 = 840
Where we take in mind the possible number of combinations of 4 out of the 7 dishes, and the possible orders of these 4 dishes.
If you want to learn more, you can read:
brainly.com/question/9976085
Answer:
3°F
Step-by-step explanation:
-3 + 12 = 9°F , it was 9°F by noon.
9 - 6 = 3° F, it was 3°F by 6pm.