Answer:

Step-by-step explanation:
From the question we are told that
Architect Measures 2.5 feet (using the Brussels measurement)
Generally in Brussels  
Therefore
     
Generally in Aalst 
Therefore Mathematically converting  to feet in Aalst measurement we get
      
 
     
 
        
             
        
        
        
Hey there! I'm happy to help!
Let's call the hamburgers h and the cheeseburgers c.
h+c=500
c=h-50
Let's plug this value for c into the first equation to solve for h.
h+h-50=500
2h-50=500
Add 50 to both sides.
2h=550
Divide both sides by 2.
h=275
Therefore, 275 hamburgers were sold on Wednesday.
Have a wonderful day! :D
 
        
             
        
        
        
Answer:
You are now 38 m below base camp.
Step-by-step explanation:
Consider the provided information.
You start hiking at an elevation that is 80 meters below base camp.
Now your initial location is 80 m below base camp, that can be represents as: -80 
Now you increase your elevation by 42.
So you go up by 42. 
In other words, you get the equation -80+42 = -38.
Since, a negative value is below the base camp, this means that you are now 38 m below base camp.
 
        
             
        
        
        
Answer:
5X + 8Y >= 300;    intersection at  (-20, 50)
Step-by-step explanation:
let t = work hours
0 < t < 30
X = time lawn mowing
Y = time babysitting.
X + Y < 30
5X + 8Y >= 300
We could solve...
X < 30 - Y
5(30 - Y) + 8Y  >=300
150 - 5Y + 8Y >= 300
3Y >=150
Y >=50
then  X < -20   
intersection at  (-20, 50)