Answers edited by Stephanie C.

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• Peggy Sue decided to enter her famous chili at her local chili cooking contest. Normally, she needs five tomatoes to make enough chili for her family of seven famous recipe. How many tomatoes should she expect to use to make her for 100 people?
  
• Given the equation #6=-s+77#, what is the value of #1+5(77-s)#?
  
• The atomic mass of fictitious element X is 51.70 amu. If element X consists of two isotopes that have mass numbers of 50 and 52, what is the approximate % natural abundance of each isotope?