I think we need a coordinate grid for that,,
I do believe that that point is -2.2 because of the fact that the difference between -1.6 and -2.4 is 0.8, and there are 4 marks in between them. So each mark's value is decreased by -0.2.
Hey!
RS = 15 and RT = 18. Subtract 18 from 15 to get your answer.

<em>That means your answer is 3</em>

** x + 5 = 7
x = 2
** x + 5 = 9
x = 4
{2,4}