Answer:
Her friend is correct 
Step-by-step explanation:
40 * 20% = 8
40+8=48
 
        
                    
             
        
        
        
Answer: y=4x-1
Step-by-step explanation: the line goes through (-2,7) and is perpendicular to the line x-4y =24 
 
        
             
        
        
        
Answer:
9
Step-by-step explanation:
When plugging 6 in for y, you get  
2x + 3(6) = 36 
You have to multiply 3 and 6, getting 
2x + 18 = 36. 
Now, you subtract 18 from both sides to isolate the x variable, getting
2x = 18
Now, you divide 2 from both sides because we want x standing by itself, getting
x = 9
Therefore, your answer is 9. 
Hope this helped
ps accepting brainliest ;)
 
        
                    
             
        
        
        
Area of a rectangle  =  length x height
Area = 135
Height = X
Lenght = x +6
135 = x * x+6
Simplify:
135 = x^2 +6x
Subtract 135 from both sides:
x^2 + 6x - 135 = 0
Solve:
2 numbers when added need to equal 6 and when multiplied equal -135
x = 9 and x = -15
The height can't be a negative number so the height is 9
Length =  9 +6 = 15
Height = 9cm, Length = 15 cm