Question

Can someone help me with all of these please if you could please answer like this

1) Answer
2) Answer
Etc....

Answer 1

17) 53°

18) 113°

19) 4

20) 7

Explanation:

19) 21x + 6 = 90

21x = 84

x = 4

20) 11x - 2 = 75

11x = 77

x = 7