In a plant, red flower color is incompletely dominant over yellow. what will the distribution of flowers in the f2 hybrids be if we start out with 60 f1 hybrids? the answer is- c. 1 red: 2 orange: 1 yellow

A Punnett square would help here. 

Let's say (R) is dominant red and (r) is recessive red, aka yellow. 

You start with F1 hybrid flowers that are all (Rr) - these are all orange. So when they reproduce, both parents are (Rr). When you create a Punnett square, you'll see that the results for the F2 generation are (RR), (rr), and (Rr) twice. 

(RR) is red, (rr) is yellow, and (Rr) is orange, just like the F1 generation.