Answer:
x = -3
Step-by-step explanation:
When you take the cube root of -27, -3 is your answer. To double check, just cube -3 (or -3 x -3 x -3) and you can see you get -27.
sum=(n-2)*180
sum=(4-2)*180
sum=2*180
sum=360º
if T=K, T=100º
360-(100+100+20)=E
E=360-220
E=140º