Answer: 441
Step-by-step explanation:
21 x 21 = 441
Answer:
2x+7y
<u>3x</u>+5y<u>-x</u>+2y =
<u>3x-x</u> = 2x
5y+2y = 7y
3x+5y-x+2y = 2x+7y
No change in area if sides of rectangle are equal.
Hope this helps.
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