Does anyone have any idea on how to do this? I have notes for it but i just don't understand how to get to the answer.. and if the picture doesn't show up let me know and i will try to figure it out..

Julius sold five times as many computers as sam sold last year. in total, they sold 78 computers. how many computers did julius sell?

Sanya noticed that the temperature was falling at a steady rate of 1.4 degrees every hour from the time that she first checked her outdoor thermometer. by 6 a. m., the temperature had fallen 21 degrees. which expression can you use to find how many hours earlier she had first checked the thermometer?

Which value of m will create a system of parallel lines with no solution? y= mx - 6 8x - 4y = 12