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genetics

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Can anyone help me with Genetics? I have some problems and answers and need them explained to me.
Here are some of the questions and answers:

1. Assume that a dihybrid cross is made in which the genes' loci are autosomal, independantly assorting, and incompletely dominant. How many different phenotypes are expected in offspring?
Answer: 9

2. Assume that a dihybrid F2 ratio, resulting from epistasis was 9:3:4. If a double heterozygote was crossed to the fully recessive type, what phenotypic ratio is expected among the offspring?
Answer: 1:1:2

3. Assume that a dihybrid F2 ratio, resulting from epistasis, was 15:1. If a double heterozygote was crossed to the fully recessive type, what phenotypic ratio is expected among offspring?
Answer:3:1

If anyone can explain how these are done I would really appreciate it!

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