Answer:
6 : 1 
Step-by-step explanation:
b - 3a / 9 = a /3
Cross multiply 
3(b - 3a) = 9a
Expand 
3b - 9a = 9a
Add 9a to both sides 
3b = 9a + 9a
3b = 18a
Divide both sides by 3 
b = 6a 
Ratio of a : b
6 : 1 
 
        
             
        
        
        
<h2>Answer:
</h2><h2>14. 2z + 3yz - 6z +2yz + y - z - 4y
2z - 6z  -4z - z
-5z + 3yz + 2yz + y - 4y  3yz + 2yz
-5z + 5yz + y - 4y
</h2><h2>Answer = -5z + 5yz - 3y  </h2><h2 /><h2>15. -4ab + 3ax + ba - 6xa
-4ab + ba
Answer = -5ab - 3xa  </h2><h2 /><h2>16. -c(3b - 7a)
-3bc - 7ac  
Step-by-step explanation:
</h2><h2>Hopes this helps. Mark as brainlest plz!</h2>
        
             
        
        
        
Answer:
0.3875
Step-by-step explanation:
Given that in a group of college students, the ratio of men to women is 3:1 (i.e., 3 to 1). In a recent survey, 40% of the men in this group selected hiking as their favorite outdoor activity whereas 35% of the women in the group selected hiking as their favorite outdoor activity
From the above information we find that
P(Men) = 0.75 and P(women) = 0.25 (since men:women = 3:1)
Out of men prob for not selecting hiking as their favorite outdoor activity

Out of women prob for not selecting hiking as their favorite outdoor activity

Prob for a randomly selected person that hiking is not his/her favorite outdoor activity = Prob (man and not selected activitiy) + P(women and not selected activity) (since men and women are mutually exclusive and exhaustive)
=
 
        
             
        
        
        
9514 1404 393
Answer:
   96 cubic feet
Step-by-step explanation:
A volume that is 16 ft by 18 ft by 1/3 ft will be ...
   V = LWH
   V = (16 ft)(18 ft)(1/3 ft) = 96 ft³
96 cubic feet of concrete are needed.