155 = 2x -15
170 = 2x
85 = x
She had 85 when she first started.
Answer:
-9
Step-by-step explanation:
The awnswer to the first equation is -4 and -4-5 is equal to -9
Answer:
Equation:
or 
Solution:
Step-by-step explanation:
The formula that is used to calculate the perimeter of a square is:

Where "s" is the side lenght the square.
Knowing that Xin used 20 yards of fencing to build the walls of a square chicken coop (in which the lenght in yards of each wall is represented with "x"), you can identify that:

Then, you can susbtitute values into the formula
:
Finally, you must solve for "x" in order to find its value.
This is:

The answer to 18m + 27n would be
Do 32,000,000 divided by 10 to get your answer.