Mr. Sam is raising chickens or ducks on his farm. All chickens eat the same amount of feed per week, and all ducks eat the same amount of feed per week. If 4 chickens and 20 ducks eat a total of 34.80 kg feed per week, and 16 chickens and 15 ducks eat a total of 41.70 kg feed per week, how much feed does a chicken and a duck eat respectively per week?

The answer is biodiversity resulting from new ancestors.

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.