Answer:
1. a) Square
2. c) Rectangle
Step-by-step explanation:
1. If you cut this rectangular prism in way to be PERPENDICULAR to the base, that means you're cutting it straight down, from the top to the bottom, in a vertical line.  The cross-section obtained will be just like an end of the prism, which in this case is a square.  Because it's a regular rectangular prism, no matter where you cut it, as long as it's vertical, perpendicular to the base, you'll get a square due to this particular form.  Technically, the answer could also be a rectangle, since a square is a rectangle.
2.  you cut this rectangular prism in way to be PARALLEL to the base, that means you're cutting it straight, from the front to the back, in an horizontal line.  The cross-section obtained will be just like an top of the prism, which in this case is a rectangle.  Because it's a regular rectangular prism, no matter where you cut it, as long as it's an horizontal line, parallel to the base, you'll get a rectangle due to this particular form.
 
        
             
        
        
        
Answer:
 104.72 m^2.
Step-by-step explanation
I'm taking the angle to be 30 degrees.
Area of sector = area of the circle * 30/360
= pi*20^2 * 30/360
= 400pi * 1/12
= 104.72 m^2.
 
        
                    
             
        
        
        
Answer:

Step-by-step explanation:
Hello,
<em>I would recommend that you checked the answers I have already provided as this is the same method for all these questions, and maybe try to solve this one before you check the solution.</em>
<u>At the beginning the area is 2100</u>
<u>After one year</u> the area will be 
    2100*(1-3.5%)=2100*0.965
<u>After n years</u> the area will be
    
So after 5 years the area will be
    
So rounded to the nearest square kilometer is 1757
Hope this helps
 
        
                    
             
        
        
        
Answer:
y = (-13/11)x - 5/11
Step-by-step explanation:
Where's the list of equations from which you're to choose?
The line that connects points (-8 ,9) and (3, -4) has the following slope:
           9 - (-4)
m = ----------------- = -13/11
           -8 - 3
Then the new line with this slope is y = (-13/11)x + c
and because (-8, 9) satisfies this equation, 9 = (-13/11)(-8) + c, and we need to calculate c from this.                                 9 = 104/11 + c, or 
                                                                         -c = 104/11 - 99/11, or - 5/11
Then the desired equation is y = (-13/11)x - 5/11