X-9 the answer is option a
        
             
        
        
        
D-10-2d+7 = 8 + d- 10 -3d
d-2d-10+7 = 8-10 +d -3d
-d-3=-2-2d
-d+2d=3-2
d=1
Final answer: C. d=1 
        
                    
             
        
        
        
numerator = top part of the fraction
denominator = bottom part of the fraction
* means multiply
a. 
you can only add the numerator when the denominator is the same
cant add the denominator 
denominator has to be the same
1/5 = 4/20
4/20 + 7/20 = 11/20
b.
1 7/8 = 15/8
3/4 ÷ 15/8 = 
3/4 * 8/15 = 
24/60 = divide both top and bottom by 12 = 
2/5
 
        
                    
             
        
        
        
3^8=6,561
6,561 •3=19,683
The highest altitude of an altocumulus cloud is 19,683 feet.
        
             
        
        
        
Answer:
2/9
Step-by-step explanation:
16/72 simplify in calculator =2/9