Trên tập hợp số nguyên Z, xét quan hệ hai ngôi S như sau: aSb  a  b chia hết cho 7, với mọi a, b  Z. Chứng minh S là một quan hệ tương đương.

step-by-step explanation:

ok one would be money, and the other would be refreshments or something similar. if each bag of popcorn is 5.00 and each drink is half of that that means drinks are 2.50 the proper way to do that would to look and see how much of each you can buy without exceeding a limit of 30.00

inverse property is the answer

step-by-step explanation:

question 1: step-by-step explanation:

1/4 of 84 = 84÷4= 21

6-3=3

3*3=9

9+12=21

21/3=7

7*8=56

56 is your answer