The last one
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This is the Pythagorean theorem where the 2 legs of a triangle squared add up to equal the squared hypotenuse (a^2 + b^2 = c^2) 
The equation would be 
12^2 + 5^2 = x^2
144 + 25 = 169
The square root of 169 = 13
Answer - 13 ft
        
             
        
        
        
Answer:
(Choice B) B It decreases.
Step-by-step explanation:
According to the situation, the solution of the value of the expression is as follows 
Let us assume
r         80 -2r
5        80 - 10 = 70
4        80 - 8 = 72
3        80 - 6 = 74
2        80 - 4 = 76
1         80 - 2 = 78
As we can from the above calculation that expression value risen if r value decreased
Therefore the correct option is B. 
 
        
                    
             
        
        
        
Answer: The area of the triangle would be 256.
Explanation: You need to multiply both 16 and 16 together, which will then get your answer which is 256.☺️
        
                    
             
        
        
        
6.213 as a mixed number would be 6 and 213/1000.
all you do to convert it to a mixed number is look at how many numbers are after the decimal.
since theres 3 numbers, that means it would be in the thousands place