How many distinct binary search trees can be formed which contains the integers 1, 2, 3?.

Ihave trouble finding the nth term of a linear sequence

Which of the following is the shape of a cross section of the figure shown below

Aclothing designer is selecting models to walk the runway for her fashion show. the clothes she designed require each model’s height to be no more than y inches from 5 feet 10 inches, or 70 inches. which graph could be used to determine the possible variance levels that would result in an acceptable height, x?