Answer:
r=3
Step-by-step explanation:
3(r - 7) = 4(2 - 2r) + 4
Distribute
3r -21 = 8 -8r +4
Combine like terms
3r -21 = 12 -8r
Add 8r to each side
3r +8r-21 = 12 -8r+8r
11r -21 = 12
Add 21 to each side
11r -21+21 =12+21
11r = 33
Divide each side by 11
11r/11 = 33/11
r = 3
Answer:
(a)
(b)
(c)NO
Step-by-step explanation:
GIVEN: Solution A is an
acid solution. Solution B is a
acid solution.
TO FIND: (a) Find the amount of Solution A (in mL) that must be added to
of Solution B in order to produce a
acid solution. (b) Find the amount of Solution A and Solution B (in mL) that can be combined in order to form a
solution that is
acid. (c) Does there exist a combination of Solution A and Solution B that is
acid.
SOLUTION:
(a)
Let total amount of solution A added be 
Total amount of mixture 
As resulting solution is
acid solution.
Amount of acid in final solution is sum of acid in both solutions



(b)
Let amount of Solution A be 
Amount of solution B 
As resulting solution is
acidic solution
Amount of acid in final solution is sum of acid in both solutions




Amount of solution B 
(c)
No as concentration of final solution can not be greater than one with higher concentration.
i just did the test and the answer was 120 trust me
Answer:
Here you go, it's In the attachment
Answer:
75/6 = 12.5
Step-by-step explanation:
Mean = The sum divided by the number of numbers.