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i need help with my math... and fast:/

Mathematics
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what are these properties of addition?

commutative, associative, or identity:

21+0=21

60+0=60

(4+5)+6=4(5+6)

(74+29)+83=74+(29+83)

15+(33+6)=(15+33)+6

149+0=149

70+80=80+70

211+586=586+211

(5+19)+14=5+(19+14)

37+(64+55)=(37+64)+55

8+43=43+8

99+0=99

352+87=87+352

(93+45)+68=93+(45+68)

51+0=51

75+(225+30)=(75+225)+30

thank you so much to whoever solves these for me! it means a lot!

Apr 9th, 2015

21+0=21  Identity

60+0=60   Identity

(4+5)+6=4(5+6)   Associative

(74+29)+83=74+(29+83)    Associative

15+(33+6)=(15+33)+6   Associative

149+0=149   Identity

70+80=80+70   Commutative

211+586=586+211   Commutative

(5+19)+14=5+(19+14)   Associative

37+(64+55)=(37+64)+55   Associative

8+43=43+8   Commutative

99+0=99   Identity

352+87=87+352   Commutative

(93+45)+68=93+(45+68)   Associative

51+0=51   Identity

75+(225+30)=(75+225)+30   Associative


Apr 8th, 2015

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Apr 9th, 2015
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Apr 9th, 2015
Dec 8th, 2016
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