Purple flowers are dominant over white flowers. a heterozygous purple flower is crossed with another heterozygous purple flower. the ratio of purple to white would be

its really hard i really want to pass the eoc

You need to draw a punnet square:
  
__|P  | w   |
|P |PP| Pw|
|w |Pw| ww|

So that means you'll have:
1/4 PP flowers, which are homozygous purple flowers
2/4 Pw flowers, which are heterozygous purple flowers
1/4 ww flowers, which are homozygous white flowers

So the ratio of purple to white flowers is 3:1 

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