Parents that are heterozygous for having freckles (dominant) are crossed. which represents the ratio of their offspring?
twenty-five percent have freckles.
twenty-five percent are ff.
seventy-five percent have freckles.
seventy-five percent are ff.

The answer is Seventy-five percent have freckles.

Freckles are dominant trait. Gene responsible for freckles has two alleles (forms):
F - a dominant allele responsible for freckles
f - a recessive allele not responsible for freckles

Thus, genotypes are:
FF - dominant homozygote with freckles
Ff - heterozygote with freckles
ff - recessive homozygote without freckles

Heterozygous parents can give either dominant or recessive allele to the offspring. After heterozygous parents (Ff) with freckles will cross, 75% of the offspring will have freckles: one FF genotype and two Ff genotypes of total 4 genotypes. (3 out of 4 can be expressed as 3/4 = 0.75 = 75%).
Take a look at the above described possible genotypes and uploaded image of Punnett square in which with yellow are marked genotypes with freckles. 

What's the yellow wallpaper?