Answer: £4.20
Each 2 of pencils is £4.20 multiply that by 3 your get 12.60, the notebook is the same price of 2 pencils so that must mean it is £4.20
4.20 x 4 = 16.80
3 £4.2 from the 6 pencils
and 1 £4.2 from the notebook
Hope this helps!
Supplementary angles have a degree measure of 180, so they look like a straight line.
Your answers are 4 and 3, 4 and 5, and 3 and 6.
If you complete the square you get

and as any number squared is positive and 4 is positive, the result must be positive
Well, because it is two years, 50x2 is 100 so 1000+100=1100
Then, you would do .25x1000 which is 2.5. That would mean you get 2.5 dollars back every month.
Therefore, your answer is...
C. $1161.76