How do i do these picture included. i will give brainliest if correct answer

(5.)
13x + 5 = 83
        -5     -5
13x =78
/13   /13
x = 6

(9.)
0.7 , 0.9 , 1.6 , 2.3 , 2.5

median = 1.6

Copy past because before, for some reason, I couldn't finish my answer.

I can only solve Q5 because I don't know all the numbers for Q9. 

1. Take +5 and do the inverse operation, which would be -5. Therefore, subtract 5 by 83. 13x + (5 - 5) = 83 - 5 ⇒ 13x = 78

2. Isolate x to find x. You do this by taking 13 and dividing it by itself and 78 (We divide it because originally, you had to multiply 13 by an unknown number. The opposite operation for multiplication is division.) 

(13/13)x = 78 ⇒ (1)x [note that 1x is just like saying x] = 6. Therefore 'x' is 6. 
3. Check your work by substituting x with 6 and see if it checks out. Solve the edited problem by PEMDAS.
13(6) + 5 = 83
78 + 5 = 83
83 = 83
It checks out.
6 being x is correct.

In this problem it decreased 20%