An airplane leaves from miami and travels around the bermuda triangle what is the value of x

If given an equation of a line such as -1/2x+6 how would you create an equation of a line parallel and perpendicula to this line that goes through another point such as (4,10)

Solve with work adding cheese to a mcdonalds quarter pounder increases the fat content from 21g to 30g. what is the percent of change ?

: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?