Answer:
x=56
Step-by-step explanation:
16 x 7= x * 2

x=56
Hope this helps :)
 
        
             
        
        
        
Answer:in what ?
Step-by-step explanation:
 
        
             
        
        
        
I like the substitution method. Which is when you make one equation equal only x or y and plug it into the other equation)
There is also the graphing method. If you graphed it, it might not be quite as accurate (at least on hand, on computer you would be pretty exact)
Then there is the elimination method. You multiply one of the equations by a coefficient so that you can eliminate x or y from the equation. 
        
             
        
        
        
The answer is 5b²/6c
Ok so you just have to simplify 
15/18 = 5/6 (cause 3*5=15 and 3*6=18)
Then you do as the picture above says.
 
        
        
        
Convert miles/hour to meters/second:
42mi/hr(0.447) = 18.77m/sec