The worng answer is [b]
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Answer:
C. -9
Step-by-step explanation:
The pattern is clearly subtracting 4 each time (or adding -4).
-5 - 4 = -9
Let 
be the volume of 20% solution, 
the volume of the 60% solution. We want a total volume of 400 mL in the final mixture, so
Each mL of either solution will contribute a corresponding concentration, and in the final mixture we want the 400 mL to have a 40% concentration, which means we should also have
Solve the system and we get 
.
Answer:
The answer is x= -6 !
Step-by-step explanation:
Answer:
h = 20
Step-by-step explanation:
h = 17 + x/6
h = 17 + (18) / 6
h = 17 + 3
h = 20
