Formula for the terms shows that it starts at 6 and decreases by 4
6, 2, -2. -6, ...
4th term is -6
you can also just put in n = 4 for the 4th term and solve for it.
B because gradient of the first line is 4/-6 which is -2/3
Quarters = x
dimes = 196 - x
10(196 - x) + 25x = 3940
1960 - 10x +25x = 3940
1960 + 15x = 3940
15x = 1980
x = 132
169 - 132 = 64
Therefor there are 132 quarters and 64 dimes
The original price was £320 before the 40% sale price
