We have

so this is indeed a difference of squares. Factorizing would give

making the answer D.
We can further factor the first term here and write

but that's clearly out of the scope of this question.
There’s no a in the the equation
Answer:
Check photo
Step-by-step explanation:
Answer:
10 is unbiased
11 is biased
Step-by-step explanation:
10 is unbiased
11 is biased
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Answer:
option 3: 3(10+5) = 30+15
Step-by-step explanation: