I want to know how to solve this (please write the solution step by step)

:24% of students in a class are girls. if there are less than 30 students in this class, how many students are there? how many girls are there?

The boiling point of water at an elevation of 0 feet is 212 degrees fahrenheit (°f). for every 1,000 feet of increase in elevation, the boiling point of water decreases by about 2°f. which of the following represents this relationship if b is the boiling point of water at an elevation of e thousand feet? a) e = 2b - 212 b) b = 2e - 212 c) e = -2b + 212 d) b = -2e + 212

Let f(x) = 5/x and g(x)=2x2+5x. what two numbers are not in the domain of f o g