There is missing data here. We have the rate and principal amount but no value given in terms of years.
The formula needed is A = p(1 + (r/n))^(nt).
Since the string has already two 2, then we will compute the whole number of strings whose length is 4, over the alphabet {0,1}:

There is then 16 such strings.
10% is 8.35. 1% is 0.83 so 2% is 1.66. 8.35+1.66=10.01. 83.47+10.01=93.48. 93.48x12=1121.76. The bill will cost £1121.76.
I guess in this equation we are assuming you are changing flights. So you would add 137.50+92.50+162.50 which equals $392.50
Answer:
slope = - 
Step-by-step explanation:
Calculate the slope m using the slope formula
m = 
with (x₁, y₁ ) = (- 2, 1) and (x₂, y₂ ) = (0, - 2)
m =
=
= - 