Answer:
Step-by-step explanation:
You need the Law of Cosines for this, namely:
 where x is the missing side.
 where x is the missing side.
 and
 and
 so
 so
x = 18.0 or just 18
 
        
             
        
        
        
Answer:
   x = 0
Step-by-step explanation:
You know the answer to this because you know the identity element for addition is 0: 5 + 0 = 5.
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Or, you can make use of the addition property of equality and add -5 to both sides of the equation:
   5 - 5 + x = 5 - 5
   x = 0 . . . . . . . . . . simplify
 
        
                    
             
        
        
        
Step-by-step explanation:
Hey, there!!
Here, one point is A(10,8) and P(8,5) is the midpoint.
Let B(x,y) be the another end point.
Now,
Using midpoint formulae, 


Since they are equal,equating with their corresponding elements we get, 

or, 16 = 10 + x
or, x=16-10
Therefore, x = 6
Now,

or, 10 = 8 + y
or, y = 2
Therefore, The coordinates of another point are B(6,2)
<em><u>Hope it helps</u></em><em><u> </u></em><em><u>.</u></em><em><u>.</u></em><em><u>.</u></em><em><u>.</u></em><em><u>.</u></em>
 
        
             
        
        
        
D = k + 20
j = 3k - 120
d = j
k + 20 = 3k - 120
20 + 120 = 3k - k
140 = 2k
140/2 = k
70 = k.....so Katie weighs 70 lbs
David and Johnathan each weigh 90 lbs