Operations On The Real Numbers

1
choose the correct answer from a, b, c or d
2
choose the correct answer from a, b, c or d
3
choose the correct answer from a, b, c or d
4
choose the correct answer from a, b, c or d
5
choose the correct answer from a, b, c or d
6
choose the correct answer from a, b, c or d
7
check the statement
8
check the statement
9
check the statement
10
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11
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12
Every real number that not equal zero has multiplicative inverse
13
The number 1 is the neutral element of multiplication
14
check the statement
15
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16
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17
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18
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19
The sum of the number and its additive inverse is equal 1
20
choose the correct answer from a, b or c
21
check the statement