Answer:
Hence, the probability of a Negative test is  .
.
Step-by-step explanation:
(a)
 Let  Drug user and
 Drug user and  Test positive
 Test positive
 Probability of drug users 
                                     
                                    
(b)
 Find the Probability of a Negative test,
      




 
        
             
        
        
        
Answer:
   66 °F
Step-by-step explanation:
At 4 P.M., the temperature had decreased by 3° from the temperature at 3 P.M., so was ...
   4 P.M. temp = 78 °F -3° = 75 °F
This was repeated until 7 P.M.
   5 P.M. temp = 75 °F -3° = 72 °F
   6 P.M. temp = 72 °F -3° = 69 °F
   7 P.M. temp = 69 °F -3° = 66 °F
The temperature at 7 P.M. was 66 °F.
__
Of course the repeated subtraction can be simplified using multiplication. The subtraction of 3° four times is equivalent to the subtraction of . . .
   (3°)(4) = 12°
That is, the temperature at 7 P.M. is ...
   78 °F -3°×4 = 78 °F -12° = 66 °F
 
        
             
        
        
        
Answer:
1) 5 2) 6 3) 1.25 or -1.75
Step-by-step explanation:
1. x^2 - 25 = 0
x^2 - 25 = 0
First, add 25 to both sides!
x^2 = 25
Now square root both sides.
x = 5
2.  (x-2)^2 = 16
First, square root both sides.
(x-2) = 4
Add 2 on both sides.
(x) = 6
x = 6
3. Quadratic Formula = -b ±  / 2a
 / 2a
Substitute in:
-6 ± / 2(2)
 / 2(2)
-6± / 4
 / 4
Both forms:
-6 +  / 4
 / 4
5 / 4 = 1.25 
Negative:
-6 - 1 / 4
-7 / 4 = -1.75
 
        
             
        
        
        
Using the four points around the drawing, we can see that angle four is connected to the vertex A. 
The answer I believe is:
D. Vertex A.
Hope I could help! Have a good one.
        
                    
             
        
        
        
Answer:
x=5
Step-by-step explanation:
We simplify the equation to the form, which is simple to understand 
3x+5-5=20-5
We move all terms containing x to the left and all other terms to the right. 
+3x=+20-5-5+5
We simplify left and right side of the equation. 
+3x=+15
We divide both sides of the equation by 3 to get x. 
x=5