Which expression is equivalent to 7a + 2a + 7 - a-2
1 answer:
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Answer:
- Option B
Step-by-step explanation:
Given Equation :
Using distribute property:
Adding the like terms we get :
Transposing the variables on the right side and constant terms on the left side :
Dividing both sides by 5 :
where
you have variance
and so the standard deiviation is