The whole number between 13 and 17 is 15
Number 17 is but 15 isn't as 5x3 isn't a prime number
32
17
There are 15 protons in 31P. All isotopes and ions of the same elements will have the same number of protons regardless of the difference in the number of neutrons or electrons. So the information about which isotope is (by saying P-31) is unneeded.
The cosine of 0.489957 radians is 15/17
multiples: 5, 10, 15 + 2 = 17 Answer: 15
It is 17.
17/15 is not equivalent to any whole number, and there's nothing you can do to it that can make it one.
15 is composite number 17, 19 and 23 are prime numbers.
15!
15