You can tell when you cant draw an even L shaped figure at the intersects of the bottom and the side. 90 degrees. But there are many different ways that may make more sense. Happy to help:)
        
                    
             
        
        
        
Answer:
Step-by-step explanation:
In each case, draw the right triangle which produces the inverse trig value. That is, label the two sides as needed, and calculate the third side.
It should be clear that


sin(2α) = 2 sinα cosα
So, 

See what you can do with the others.
 
        
             
        
        
        
Any number less than or equal to 12
        
             
        
        
        
Answer:
(x-2)^1/4=2 ---> 18
√x^2+7=4. ---> -3
^3√1-x=-1. ---> 2
Step-by-step explanation:
just did it on plato
 
        
             
        
        
        
Answer:
D. 8
Step-by-step explanation:
The given diagram is a trapezium. We know that the consective sides of a trapezium are equal. so,
Putting the values of consecutive sides equal:
So, KI will be equal to LI
3x-7 = x+3

Putting the value of x in the equation of KI
3x-7
=3(5)-7
=15-7
=8
Hence, the correct answer is D. 8 ..