Kathleen lost a tooth today. Now she has lost 4 more than her sister Cara lost.
1. Write an expression to represent the number of teeth Cara has lost. Let K represent the number of teeth Kathleen lost.
2. Write an expression to represent the number of teeth Kathleen has lost. Let C represent the number of teeth Cara lost.
3. If Cara lost 3 teeth, how many teeth has Kathleen lost?