12:9, 12/9, and 12 to 9. The way I got 12 and 9 was by simplifying 60/45.
In order to do mean you have to add all of the numbers in the list together. then divide them by the total amount of numbers (ex. 7,9,3,2,5. you would add all of these up 7+9+3+2+5=26 then you would divide that by 5 because there are five numbers in the list.
1.50y(2)+2.00x=20
Now use the quadratic formula to solve
