Find the x-intercepts for y = -7x2 + 4x + 9 using the quadratic formula. Choose all correct answers.

Ineed to learn how to solve this problem

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.)

Ijust need to see how to do this. so you don’t have to answer all of them just a step by step explanation of one.