Answer:

Step-by-step explanation:
- Option A ![[x+5=20]](https://tex.z-dn.net/?f=%5Bx%2B5%3D20%5D) tells us that: When we add 5 to a variable x, we get 20. As it has a unique value for x and is completely equal to it(i.e. 15), It is an equality. tells us that: When we add 5 to a variable x, we get 20. As it has a unique value for x and is completely equal to it(i.e. 15), It is an equality.
- Option B![[x=5]](https://tex.z-dn.net/?f=%5Bx%3D5%5D) tells us that: A variable x equals to 5. Hence, as x is unique for 5 and is wholly equal to it, it's an equality too. tells us that: A variable x equals to 5. Hence, as x is unique for 5 and is wholly equal to it, it's an equality too.
- Option C tells us that: A variable x isn't 5 but lesser than it. As we cannot equate it to 5, nor we are given the nature of the variable x, it is an Inequality. tells us that: A variable x isn't 5 but lesser than it. As we cannot equate it to 5, nor we are given the nature of the variable x, it is an Inequality.
- Option D![[x+5]](https://tex.z-dn.net/?f=%5Bx%2B5%5D) is an expression; It can't be called an equation or an inequality unless we relate it with another expression. is an expression; It can't be called an equation or an inequality unless we relate it with another expression.
 
        
                    
             
        
        
        
Surface area of the the rectangles:
8 * 5 + 8 * 4 + 8 * 3 = 96
Surface area of the two triangles:
Use bh/2 base time height over 2
(4 * 3)/2 = 6
There are 2 triangles, 2 * 6 = 12
12 + 96 = 108
        
             
        
        
        
Answer:
<h3>a1 = 63</h3><h3>an = 3(22-n) .........</h3>
 
        
             
        
        
        
Answer:
the building would be 280 feet (judging on how this is worded.)
Step-by-step explanation:
you are already 100 meters from the base ( bottom) of the building so you add 180 as you are 180 ft from the top of the building. 100 + 180 is equal to 280.