OpenStudy (ayanaortega):

can someone help me please Which number is a prime? A. 59 B. 27 C.14 D.91 I will give you a medal and become your fan.

2 years ago
OpenStudy (ayanaortega):

no

2 years ago
OpenStudy (volleyballlover55):

A prime number is a whole number greater than 1, whose only two whole-number factors are 1 and itself. The first few prime numbers are 2, 3, 5, 7, 11, 13, 17, 19, 23, and 29.

2 years ago
OpenStudy (volleyballlover55):

So do you know which numbers we can eliminate already?

2 years ago
OpenStudy (ayanaortega):

A

2 years ago
OpenStudy (volleyballlover55):

and?

2 years ago
OpenStudy (ayanaortega):

C

2 years ago
OpenStudy (volleyballlover55):

correct.. so do you know which one is prime? and no A cannot be eliminated.

2 years ago
OpenStudy (ayanaortega):

B

2 years ago
OpenStudy (volleyballlover55):

yes.... so which number is prime??? :)

2 years ago
OpenStudy (ayanaortega):

D is a prime right

2 years ago
OpenStudy (volleyballlover55):

no

2 years ago
OpenStudy (ayanaortega):

then A

2 years ago
OpenStudy (volleyballlover55):

Correct!

2 years ago

59 is a prime number. For some numbers, an easy way to test for primality is to determine whether the number can be divided by any integer less than the square root and yield no remainder (this is called the divisibility of the number). If yes or if the square root is an integer or both, then the number is not prime. If no, then the number is prime. The square root of 59 is between 7 and 8 (the square root of 49 is 7, and for 64, the square root is 8). But since 59 cannot be divided by 2 and yield no remainder (that is, 59 is not divisible by 2), we need not test 4, 6 or 8 either; for if 59 was divisible by 4, 6 or any multiple of 2 actually, then 59 would also be divisible by 2. We thus need only test 3, 5 and 7. But dividing 59 by any of those numbers would yield a remainder, so 59 is not divisible by any of the above numbers. So 59 is not divisible by any integer that is less than or equal to its square root and 59 is prime.

2 years ago
OpenStudy (devonhoward15):

a

2 years ago
OpenStudy (devonhoward15):

@AyanaOrtega

2 years ago
OpenStudy (peachescherry14):

it was b not a

2 years ago