The chemical diacetyl is a natural flavoring that gives the taste of butter . A human can distinguish the butter flavor with 5 ppb (parts per billion).
One gallon is approximately 75,000 drops of water. How many gallons of
water are equivalent to one billion drops?
13,000
15,000
17,000
19,000

Awrestling tournament begins with 128 competitors. in the first round, each competitor has 1 match against another wrestler. the winner of each match moves on to the next round until there is a winner. write a sequence in which the terms represent the number of players still in the tournament at the end of each round. describe the sequence? how many rounds are in the tournament?

On a string instrument, the length of a string varies inversely as the frequency of its vibrations. an 11-inch string has a frequency of 400 cylces per second. find the frequency of a 10-icnch string.

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