A chemist claims that he has found a chemical formula that will kill a certain bacteria. He claims it will kill half the bacteri
a in 40 seconds, and in the next 40 seconds kill half of the remaining half, and so on. If he is correct, and at a certain time there are 30 bacteria still alive, how many bacteria were alive 4 minutes earlier? PLEASE EXPLAIN CLEARLY !!
You multiply what's on the outside of the parenthesis by everything on the inside, so you would do 3 times x and 3 times 2. They don't combine because they are like terms.
