The stem-and-leaf plot shows the ages of residents of a retirement home. how many residents are older than 80? ages of residents sandy ridge autumn care leaf stem leaf 1 3 4 6 0 2 1 3 3 5 6 7 2 4 5 6 6 6 8 2 4 4 4 7 9 8 1 2 2 4 1 1 6 6 8 8 9 9 1 2 9 9 9 0 10 0 1 2 a. sandy ridge, 6; autumn care 4 b. sandy ridge, 13; autumn care 11 c. sandy ridge, 8; autumn care 9 d. sandy ridge, 14; autumn care 12