Answer:
(a) x= 20 (b) x= 41
Explanation:
(a)
180-54= 126
360-126-90= 144
7x+4= 144
7x= 140
x= 20
(b)
(n-2)(180)= (5-2)(180)
= 540
(2x-10)+3x+(4x+20)+(2x-5)+(2x+2)= 13x+7
13x+7= 540
13x= 533
x= 41
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