Answer: 153
Step-by-step explanation:
When we have a group of N elements, the total number of combinations of K elements ( K ≤ N) is:

Where N! = N*(N - 1)*(N - 2)*...*2*1
In this case, we have a group of 18 people (then N = 18) and we want to see how many different combinations of 2 we can make (K = 2).
Using the above equation we get:

There are 153 different ways in which the manager can do this.
Answer:
270
Step-by-step explanation:
90 devided by 2.5 = 36 and 36 x 7.5 = 270
5/8 > 11/16
Hope that works out for you
Answer:
-4 = 5 - 9
Step-by-step explanation:
-4 = ? - 9
Add 9 to -4
5
The result of -4 = ? - 9 is 5
-4 = 5 - 9
-4 = -4