How to tell if a math intersection is going to be a right angle?

Jack is considering a list of features and fees for denver bank. jack plans on using network atms about 4 times per month. what would be jack’s total estimated annual fees for a checking account with direct paycheck deposit, one overdraft per year, and no 2nd copies of statements?

Answer this question only if you know the 30 points and

For the equations below which statement is true ? -2x=14 6x=-42