Answer:
The actual building will be 7.5 m tall 
Step-by-step explanation:
Given the scale model value of the building, we want to find the actual height of the building 
From the scale model;
1 cm = 0.5m
Thus 15 cm will be 15 * 0.5 = 7.5 m 
 
        
             
        
        
        
If it is #17 this:
the class sold 45 sandwiches and collected $150.75, all you need to do is divide.
150.75/45
= 3.35
$3.35 per sandwitch
        
             
        
        
        
Answer:
No, it is not a square
Step-by-step explanation:
If one wall is 19", that would mean the wall perpendicular to this wall is also 19" (in fact all of the walls would be 19"!) If this was a square, then the diagonal we draw at 20.62" would serve as the hypotenuse of a right triangle.  One wall would serve as a leg, and another wall as another leg.  If this is a square, then the Pythagorean's Theorem would be satisfied when we plug in the 2 wall measures for a and b, and the diagonal for c:

We need to see if this is a true statement.  If the left side equals the right side, then the 2 legs of the right triangle are the same length, and the room, then is a square.
361 + 361 = 425.1844
Is this true?  Does 722 = 425.1844?  Definitely not.  That means that the room is not a square.
 
        
             
        
        
        
Answer:
- 1.67
Step-by-step explanation:
f(x) =  -
 - 
     =   -
 - 
     =  - 2
 - 2
     = - 1 
     = -1.6666666
     = -1.67
 
        
             
        
        
        
2(3r+7)−(2+r)
Use distributive property:
6r + 14 - 2 - r
 Simplify by combining like terms:
5r +12