Answer:
See below.
Step-by-step explanation:
Addition: closed
Example: -5 + 10 = 5, and -5, 10, and 5 are all integers
Subtraction: closed
Example: 10 - 8 = 2, and 10, 8, and 2 are all integers
Multiplication: closed
Example: -4 * 7 = -28, and -4, -7 and -28 are all integers
Division: not closed
Example: 5/2 = 2.5, and 2.5 is not an integer, although 2 and 5 are integers
The set of integers is closed under addition, subtraction, and multiplication because any addition, subtraction, or multiplication of integers always results in an integer.
The set of integers is not closed under division because a division of integers does not always result in an integer.
Here we go ~
![\qquad \sf \dashrightarrow \: \sqrt[4]{x - 4} = 3](https://tex.z-dn.net/?f=%5Cqquad%20%5Csf%20%20%5Cdashrightarrow%20%5C%3A%20%20%5Csqrt%5B4%5D%7Bx%20-%204%7D%20%20%3D%203)
So, the correct choice is 85
Answer: 2/561
Step-by-step explanation:
You have 36 possibilities for the first one
you have 35 possibilities for the second one
you have 34 possibilities for the third one
you have 33 possibilities for the last one
36*35*34*33
10*9*8*7= 5040
