Answer:
R=12 is the solution
I don't know how to explain but it needs to be 20 characters
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❖ The 3 remains the same when 9,321 is rounded because if you look to the right of the number in the hundreds place, you see 2. 5 and above, give it a shove (round up). 4 and below, leave it alone (round down). Since 2 is below 5, we leave it alone. So 9,321 is rounded to 9,300.
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The answer is a, it adds one block
