3 years ago

Explain how to add -7 + 12 as if you were teaching it to someone else.

1 answer:

3 0

Because 12 is bigger than 7, the answer will be positive because the bigger number is positive, and when you have a negative and positive you must subtract and use the sign of the bigger number.

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3 years ago

When 40% of a number is added to the number and the result is 126 , what is the number ?

Rzqust [24]

$p\%=\dfrac{p}{100}\\\\40\%=\dfrac{40}{100}=\dfrc{4}{10}=0.4\\\\n-a\ number\\\\40\%\ of\ a\ number\to0.4n\\\\The\ equation:\\\\n+0.4n=126\\\\1.4n=126\qquad\text{divide both sides by 1.6}\\\\\boxed{n=90}\\\\Answer:\ The\ number\ is\ equal\ 90.$