A newborn increases its weight by 60% during the first 3 months of life. If my niece weighs 5.6 kg right now and was born three months ago, what was her birth weight?

Her weight three month ago was 2.24 kg

Step-by-step explanation:

This is because it was stated that , newborns increase in weight by 60% for the first 3 months of their lives. Therefore, we calculate 60% of her weight now and subtract it from her weight now to get her weight 3 months ago

60% of 5.6 kg = 3.36 kg

therefore, 5.6 - 3.36 = 2.24kg

answer:   x = 3 + √11     and     x = 3 - √11

step-by-step explanation:

x² - 6x + 9 = 11

(x - 3)² = 11

x - 3 = ±√11

    x = 3 ± √11

x = 3 + √11     and     x = 3 - √11