During normal breathing, about 12% of the air in the lungs is replaced after one breath. How much of the amount of the original air left in the lungs if the initial amount of air in the lungs is 500 mL after 5 breaths. 881.17ml
263.87ml
250ml
0.375ml

First step is to get rid of the square root. remember that a square root is the same as raising to the (1/2) power. see below: multiply exponents per exponent rules to get: remember you subtract exponents from the denominator and add exponents in the numerator so: simplify further: so a is the correct choice. if you don't understand this google exponent rules and it will you understand. look at the image results.