It’s 6 just count the x’s after 55
For number 1) You need to get m alone, so you must add 4.4 to 2.6.
For number 2) Same thing as #1
For number 3) You must get c alone, you need to divide 10 by 2.5
For number 4) Same as #3
For number 5) You need to get t alone, so you must multiply both sides by 2.5
For number 6) Same as #5
I would say that the second deal is the Best because you get more milk for the cheapest price.
<10, 15> + <-8, 0> + <0 , -8> + <10, 0> = <2, 7>
v = <2, 7>
||v||2 = 22 + 72
