Answer:
-3 < z < 3
Step-by-step explanation:
×4
10 < 2z + 16 < 22. -16
-6 < 2z < 6. ÷2
-3 < z < 3
Let 
be the number of liters of the 10% solution to be used, and 
the number of liters of the 4% solution. The chemist wants to end up with a 4 liter solution, so
For each liter used in the mixture, a concentration of either 10% or 4% acid will be contributed, and the goal is to make a 4L solution whose concentration is 7%, which means
Solving for 
gives 
, so 2L of both solutions is needed.
Answer:
8x= y
Step-by-step explanation:
from what a can see the line passes through the point (10,80) meaning for every 10 x there is 80y
so you can just divide 80 by 10
Answer:
Distributive property is used to expand expressions by multiplying the factor to every term in the group and combining similar terms if there are any. Hope this helps!
Step-by-step explanation:
An example is...
3(x+4) + 3(y-8)
This is the same thing as...
3x + 12 + 3y -8
Since there are 28 tens which is basically 28 rows of 10 all you have to do is 28 times 10. Whatever number times ten has a 0 after it so the answer is 280
