There was a sample of 800 milligrams of a radioactive substance to start a study. Since then, the sample has decayed by 2.7% each year.

Ithink the answer is b i hope it my friend message me if i’m wrong and i’ll change my answer and fix it for you

Um what? rephrase that ?

Answerthe simplified expression isexplanationthe given expression is,let us deal with the bracket first.the two negatives in the parenthesis will become positive.the expression now becomes,we now expand the parenthesis to get,we group like terms to obtain,this simplifies to,

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.