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Evgen [1.6K]
3 years ago
12

Help me with number 11

Mathematics
1 answer:
olga2289 [7]3 years ago
8 0
Associative Property...

(7+x)+3= 7+(x+3)

this is the correct one !!!
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Could someone explain why (-4)² is equal to 16 but -4² is equal to -16​
erica [24]

Answer:

It's all about the brackets.

Step-by-step explanation:

If we do (-4)^2, the brackets make it -4 x -4 and the two negatives make a positive of 16.

If we do -4^2, that means that the 4 is squared before putting the minus sign there so you have 4x4 = 16 then put the minus to get -16.

Hope this helps!

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3 years ago
There were some people on a train. 19 people got off the train at the first stop. 17 people get on the train. Now there is 63 pe
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Answer:

65 people.

Step-by-step explanation:

We have to work backwards.

We end with 63 people, and at the stop we lost 19 people and gained 17.

x - 19 + 17 = 63\\; if x = # people at the beginning

x - 19 + 17 = 63\\x - 2 = 63\\x = 65

There were 65 people on the train to begin with.

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