Hey! :)
Some things to note: When you bring a exponent to the numerator, you make it negative.
When you put an exponent to another exponent, you multiply the exponents together.

so that is your answer, please let me know if you need more of an explanation. :)
Answer:

Step-by-step explanation:
Given the expression

Remove parentheses: (a)=a

Group like terms

Add similar elements
∵ 
Add similar elements
∵ 
Thus, the equivalent expression in simplified form:

Answer:
-1
Explanation:
X - 9 = -10
+9 +9
——————
X = -1
4 packages of hotdogs and 5 packages of rolls
Πr^2=area 9=r 9^2=81π=254.47