The answer is 5/6, 4/5, and 3/12.  All you needed to do was change the fraction into decimals.
 
        
             
        
        
        
Answer:
125
Step-by-step explanation:
The total number of marbles is 6+10 = 16
P (black) = black / total
                = 10/16  = 5/8
With 200 draws, take the probability of P(black) times 200 since the marble is returned each time
200 * (5/8) = 125
We would expect to get 125 black marbles
 
        
             
        
        
        
Hello!
Answer:

3/4x = -24
To isolate the "x" variable, divide both sides by 3/4 (multiply by its reciprocal, or 4/3)
3/4x · 4/3 = -24 · 4/3
x = (-24 · 4) / 3 
x = -32.
 
        
                    
             
        
        
        
Angle-5 and angle-7 are 'vertical angles', so they're equal,
and we can write ...
                                           <u>10x- 9  =  9x</u>
Subtract  9x  from each side:  x - 9 = 0
Add  9  to each side:              <u> x     =  9</u>
Now that we know what 'x' is, we can find the size of Angles-5  and -7 .
Angle-7  =  9x  = 81° .
Now look at Angle-6 ... the one that's the answer to the problem.
Angle-6  and -7 together make a straight line, so they must
add up to 180°.
                                     <u>Angle-6  +  81°  =  180°</u>
Subtract 81° from each side:    Angle-6  =  <em>99° .</em>