Im posting several questions i need with in an image

Answers:
(1) n = 4
(2) x = 30
(3) a = -4
(4) n =10
(5) n = -46.2

Explanation:
(1) Given
9n-8 = 28
9n = 28 + 8
9n = 36
n=4

(2) Given
-1-x = -31
-x = -31 + 1
x = +31 - 1
x = 30

(3) Given
9-4a = -5a + 5
-4a + 5a = 5 - 9
a = -4

(4) Given
n/2 = 5
n=5*2
n = 10

(5) Given
29.5 = -16.7 -n
n = -16.7 - 29.5
n = -46.2

There is no question, there is just the answer.