Answer:
1
Step-by-step explanation:
81/90 + 9/81 = 90/90 = 1
Solution: We have to choose two positions president and vice president from eight people. So, we need to use the Permutations formula in order to find the possible number of combinations.
The number of possible combinations is:
8P2 



Therefore the possible number of combination to select two positions from 8 people is 56
Answer:
16-11-13-5-10 => P-K-M-E-J
2-15-18 => B-O-R
13-23 = > M-W
8-11-17 => H-K-Q
11-12 => K-L
22-11-12-19 => V-K-L-S
Step-by-step explanation:
Given
See attachment for code key
Required
Decode
16-11-13-5-10
2-15-18
13-23
8-11-17
11-12
22-11-12-19
From the code key, we can see that each number represent the alphabet at that position;
To do this, we simply replace each number with the alphabet they represent.
So, we have:
16-11-13-5-10 => P-K-M-E-J
2-15-18 => B-O-R
13-23 = > M-W
8-11-17 => H-K-Q
11-12 => K-L
22-11-12-19 => V-K-L-S
(8,-98) is not a solution for the function.
The multiplicative inverse of -2/5 is -5/2