If red flowers were crossed with white flowers and all the resulting flowers were pink, what percentage of a c

A cross between red and white flowers will yield all pink flowers because of heterozygosity. The pink flowers only have one copy of the "red" gene so are producing less of the pigment. Thus the percentage of the cross that is heterozygous is 100% (I'm guessing that's what the rest of your question was).

If red flowers were crossed with white flowers and all the resulting flowers were pink, what percentage of a c
both red and white are dominant so both appear and it just seems pink.

Toothbrush