Both plants are heterozygous for purple flowers. use the letter p.

On a punnet square, let P equal the variable. 
    P    p 
P PP  pp 
p Pp   pp

25% of the offspring will be Homozygous dominant, 50% will be Homozygous recessive, and 25% will be Heterozygous dominant. 

Note: 
Heterozygous means Pp since "Hetero" means different.
Homozygous means PP or pp since "Homo" means same. 

The scientific method is a series of steps followed by scientific investigators to answer specific questions about the natural world. it involves making observations, formulating a hypothesis, and conducting scientific experiments.the steps of the scientific method are •observation-the first step of the scientific method involves making an observation about something that interests you•question-once you've made your observation, you must formulate a question about what you have observed. •hypothesis-once you've made your observation, you must formulate a question about what you have observed. •experiment-once you've developed a hypothesis, you must design and conduct an experiment that will test it.•results-the results are where you report what happened in the experiment. •conclusion-the final step of the scientific method is developing a conclusion.i hope that this you : )