Answer:
The answer is B: The area of the new rectangle is double it's original size
34 tens + 20 tens = ?
1 ten = 10 ones or 10.
34 + 20 = 54
54 tens
34 tens + 20 tens = 54 tens
54 × 10 = 540
34 tens + 20 tens = ?
34 tens + 20 tens = 54 tens
34 tens + 20 tens = 540
Hello Again! :)
This time I got the correct answer, for you this time....

:
⋆┈┈。゚❃ུ۪ ❀ུ۪ ❁ུ۪ ❃ུ۪ ❀ུ۪ ゚。┈┈⋆
:
᠃ ⚘᠂ ⚘ ˚ ⚘ ᠂ ⚘ ᠃
⋆ Proof, is shown below of the question:
Hope It Helped! :)
And Tell me if the answer is wrong. . .
Good Luck With Your Assignment!
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Jace ☆