After a genetics experiment on 61 pea plants, the number of plants having certain characteristics was tallied, with the results given to the right. answer parts (a) through (c).
(a) find the number of plants that were tall and had smooth peas.

nothing plants
22
were tall;
30
had green peas;
34
had smooth peas;
8
were tall and had green peas;
16
had green peas and smooth peas;
3
had all three characteristics;
6
had none of the characteristics.