In the diagram of circle o, chords ac and bd are perpendicular to each other.
a.95°
b.90°
c.85°
d.80°

Suppose that an airline uses a seat width of 16.516.5 in. assume men have hip breadths that are normally distributed with a mean of 14.414.4 in. and a standard deviation of 0.90.9 in. complete parts (a) through (c) below. (a) find the probability that if an individual man is randomly selected, his hip breadth will be greater than 16.516.5 in. the probability is nothing. (round to four decimal places as needed.)

What is the best way to answer questions with a x expression in the question. for example 3x + 10x=?

How do i simply this expression (quadratic formula basis) on a ti-84 or normal calculator?