Example: If it was 15+7 you would break the 7 into a number that would make 7 and is easy to work with so I would break 7 into 5 and 2 then I would do 5+15 is 20+2 is 22 So 15+7 is 22
Hope this helps
Answer:

Step-by-step explanation:

( Sum of angle in straight line )
Collect like terms
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Calculate the sum or difference
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Move 120 to right hand side hand change it's sign
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Subtract 120 from 180
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Divide both sides of the equation by 4
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Calculate
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Hope I helped!
Best regards!!
Answer:
(
a
−
1
+
b
)(
a
−
1
−
b
)
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2(2x +2y) and <span>√(4x + 4y)^2</span>