Answer:
120 cm²
Step-by-step explanation:
From the question;
- Length is 12 cm 
- Width is 10 cm 
We are required  to determine the area of the cross section;
- Note that the cross section is the plane of a solid that remains constant through the solid.
- In this case, the cross section is a rectangle whose dimensions are 12 cm by 10 cm.
But Area of a rectangle = Length × Width 
Therefore;
Area of cross section = 12 cm × 10 cm 
                                     = 120 cm²
Thus, area of the cross section is 120 cm²
 
        
             
        
        
        
Basically anything greater than zero...k>0
 
        
             
        
        
        
Answer:
d. both the slope and price elasticity of demand are equal to 0.
Step-by-step explanation:
In order to graph the demand curve, the quantity demanded is plotted along x-axis and the price is plotted along y-axis. An image attached below shows the horizontal demand curve.
Horizontal demand curve, as its name indicates, is a horizontal line which is parallel to x-axis. Since, the slope of any line parallel to x-axis is 0, we can conclude that the slope of Horizontal demand curve is 0.
A horizontal demand curve can be observed for a perfectly competitive market. Since, its a perfect competition, the price of a product by all competitors will be the same. In this case, if a firm decides to increase the price, he will loose his market share as no customer will buy the product at increased price. They will rather go with the other competitor who is offering a similar product at lower price.
On the other hand, if a competitor decides to lower his price in such case, he will experience loss. Therefore, the competitors do not have the option to change the price. Therefore, we can say the price elasticity of demand in this case is 0. 
So, option D describes the horizontal demand curve correctly.
 
        
             
        
        
        
If that is a rhombus as it says it is, then the diagonals are perpendicular to one another, meaning where they meet, they form right angles.  Therefore, angle x is a 90 degree angle.