The answer to this question is £155
4. proportional
5. proportional
6. I don't know what functions are
7. It has a straight line and distance is proportional to time.
<span>2.5 – 1.2x < 6.5 – 3.2x
-1.2x + 3.2x < 6.5 - 2.5
3.2x - 1.2x < 4
2x < 4
x < 4/2
x < 2</span>