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The allele for a widows peak has complete dominance over the allele for a straight hairline (w)what is the probability of a man with a straight hairline (ww) and a woman with a widows peak WW having an offspring without a widows peak

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I would think it's 25%.
If you use a Punnett square, you see that there is a 25% chance of a homozygous dominant offspring, a 50% chance of a heterozygous dominant offspring, and a 25% chance of a homozygous recessive offspring. The homozygous recessive individual is the only one that will exhibit the non widows peak phenotype, therefore the chance of this is 25%