Show that the vectors 3i – j + 7k and –6i + 3j + 3k are at right

angle to each other.​

You decide instead to take the train there. the train will take 135 minutes. convert this into hours and minutes.

Aschool puts on a play. the play costs $1,200 in expenses. the students charge $4.00 for tickets. there will be one performance of the play in an auditorium that seats 500 people. what is the domain of the function that shows the profit as a function of the number of tickets sold?  

Astore has clearance items that have been marked down by 60%. they are having a sale, advertising an additional 55% off clearance items. what percent of the original price do you end up paying?