Answer:
the answer is top secret
Step-by-step explanation:
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To get X and Y by itself, move everything else to the other side of the equal sign. Do this by doing the opposite operation.
Example: x-2y=11
add 2y to both sides to get x by itself
x=2y+11
Answer:

Step-by-step explanation:

Find the common denominator and multiply each side by that number


<u>For bolded part in explanation</u>: 4·3=12 3·3=9
3·4=12 1·4=4
The answer is B. Use the u.s rule to solve the balance after payments for the 100th and 180th