Answer:
So, 
Step-by-step explanation:

To evaluete this expression we apply exponential property

IF any expression has exponent 0 then the value is 1 always
for example, 

because exponent is 0
So, 
Answer:
-18
Step-by-step explanation:
Hope this helped! I decided to write it out for you so it would be easier to explain.
Step-by-step explanation:
eight times the difference of 2 and a number would be 8 × (2-x)