Answer:

Step-by-step explanation:

Subtracting 4x from both sides of the inequality.

Simplifying the inequality.

Octagon has 8 sides so the sum of the angles of the octagon is 180(8-2)=180 (6)=1080 degrees
Answer:
35/3
Step-by-step explanation:

Simplify to get
9x+14=3(4x-7)
35=3x
x=35/3 or 11.66
Answer:
4$
Step-by-step explanation:
The first solution contributes 0.78*1 = 0.78 L of acid.
The second contributes 0.64*6 = 3.84 L of acid.
There will be 7 L total of the new solution, and 3.84 + 0.78 = 4.62 total L of acid in it. So the new solution has a concentration of 4.62/7 = 0.66, or about 66%.