<h3>
Answer: 39</h3>
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Explanation:
You can use the nCr formula shown below

where n = 39 and r = 1. However, you could also use the identity

which basically says there are n ways to pick 1 item if you are given a choice of n items. In this specific case, we have 39 items total, and there are 39 ways to pick one item.
The answer is 14.4 because you divide 36 and 2.5 and that’s what you would get
Answer:
answer for a,b and c are all zero (0).
reasons for all:
zero(0) divided by any number is zero(0).
28 = 3x+4x
x = 4
3x = 12
4x = 16
12:16 = 3:4