Answer:
h = 19.7 ft.
Step-by-step explanation:
Use the Pythagoras Theorem 

Now we take square root on both sides,

so the value of h equals 19.7 ft.
 
        
             
        
        
        
It's C.  In order to be in standard form you have to have all your exponents in descending order.  They don't all have to be there in order, the ones that are just have to go from highest to lowest.
        
                    
             
        
        
        
Is this for area and perimeter? If so, first make the fraction a decimal, (that would be 3.5). Then, for permeter, add 3.5 + 3.5 + 9 + 9, which is 25, for area, multiply 3.5 by 9, which is 31.5. Hope this helped!
        
             
        
        
        
Answer:
Below!
Explanation:
A system of equations with infinite solutions defines that both the equations are identical and are overlapping when the lines are graphed. An example could be y = 5x + 9 and y = 5x + 9. These sets of equations have infinite solutions because they are the same and when graphed, they overlap.
Hoped this helped!
 
        
             
        
        
        
I'm assuming that subtraction sign is mean to be an equals sign. If that is true than the answer is 403.75.