Answer:
1. 
2. 7
3. 18
Step-by-step explanation:
Question 1:
Given:
The expression to simplify is
.
We use the property of exponent 
Therefore, 
Question 2:
Given:
The expression to simplify is
.
We add the fractions first inside the parenthesis.
So, 
Now, 
Question 3:
The first five prime numbers are 1, 2, 3, 5, and 7.
Therefore, the sum of these five numbers is given as:

I think yes. If not my bad.
This deal is cheap! Well, the answer is 60 cents. To get these problems, divide 10.80 by 18, which is equal to 1.5 a dozen.
Answer: 398cm²
Step-by-step explanation:
Surface area of a Rectangular Prism: 2lw+2lh+2wh
l= 5cm
w= 9cm
h= 11cm
Area= (2x5x9)+(2x5x11)+(2x9x11)
=398cm²
Perimeter of rectangle is calculated by using formula 2*(a+b) where "a" and "b" are dimensions of rectangle (its width and height). If we replace "a" with "x" and "b" with "9" as those are dimensions of the frame the answer is 2*(x+9) which is the same as 2*x + 18.