Answer:
1. Yes, if a red flower with genotype RR and a white flower with genotype WW were crossbred, resulting in 100% of the offspring having the same phenotype, then this would be an example of complete dominance. In complete dominance, the dominant allele completely masks the recessive allele, meaning that only the dominant phenotype is expressed in individuals that carry at least one copy of the dominant allele. Therefore, in this case, all the offspring would have the same phenotype as the parent with the dominant allele, which is red.
It would be Red (flowers).
2. The phenotype in this case would be "pink" as it is an intermediate phenotype between the red and white phenotypes of the two homozygous parents.
The phenotype in this case would be "pink phenotype".
(I'm not sure if this might be right!)
3. Red and White
Hope this helps, let me know if you need more help! Sorry if I answered something wrong! :]