1. The operation © is defined on the set S = {a, b,c}, as shown in the following table. For example, a©b=b and b © a=b ,c ©a=c. a a. Is S closed with respect to ©? b. Is © commutative on set S? c. Is there an identity for © on S? If yes, what is it? d. Is © associative on S? 2. Give a set that is not closed under addition. 3. Is the set of whole numbers commutative under subtraction? If not, give a counter example.

its d. the first coordintaes are 10,32

step-by-step explanation:

your question is incomplete, write all the numbers in the sequence that it tells you.  

step-by-step explanation:

all three statements are true

step-by-step explanation:

a shipping fee of 5% is charged online with every item purchased online

first let's just take each option and calculate them based on this, to see if the answers matched

keith buys a 40 dollar book

40 x 0.05 = 2

therefore there will be a two dollar fee on keith's book

40 + 2 =42

the first statement is true

a chair costs $80

80 x 0.05 = 4

80 + 4 = 84

the second statement is true

george buys a 20 dollar calculator

20 x 0.05 = 1

20 + 1 = 21

the third statements are true

all three statements are true