Answer:
The answer is D. Surface Tension. :) I am forsure this is correct but please let me know. If I am correct please rate me 5 and thank me and mark me brainlest :)
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:
An apple costs $0.45 and a banana costs $0.66.
Step-by-step explanation:
This question is solved by a system of equations.
I am going to say that:
An apple costs x.
A banana costs y.
2 apple and 5 bananas cost 4.20 dollars 
This means that:

So


3 apples and 4 bananas cost 4.
This means that:

Since 





Then:

An apple costs $0.45 and a banana costs $0.66.
 
        
             
        
        
        
11 = -d+15
subtract 15 from each side
-4 = -d
 divide both sides by -1
d = 4
 
        
             
        
        
        
Answer:
x = 5
Step-by-step explanation:
Ashley and Adam spent a total of 31 hours on their projects so: 3x+2+4x-6 = 31
3x+2+4x-6 = 31
7x-4 = 31
7x = 35
x = 5
 
        
             
        
        
        
Answer:
x = 12.5
Step-by-step explanation:
By Pythagoras' 
16² = 10² + x²
x² = 16² - 10²
x = √(16² - 10²)
x = 12.489...
x = 12.5 (nearest tenth)