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19-06-2016
Mathematics

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Pls help me with 19,20 pls thx and show me how u did it

Pls help me with 1920 pls thx and show me how u did it class=

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19-06-2016

For number 19:
"at least 150" means either 150 ≤ ? or ? ≥ 150

plus 3 so +3x

The answer would be 150 ≤ 100 + 3x

Number 20:

A is at -2.5. The inverse is the opposite so 2.5

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