Answer:

Step-by-step explanation:
We are given the expression, 
On simplifying, we have,

i.e. 
Now, we will rationalize the expression,
i.e. 
i.e. 
i.e. 
Since,
, we get,
i.e. 
i.e. 
So, the simplified expression is
.
Answer: David conducted (an observational study) because (it studies human behavior) and (the sample is not manuipulated).
Step-by-step explanation:
hope this helps! (:
Answer:
Step-by-step explanation: 2-56 (Point -2 + 4
Answer:
60%
Step-by-step explanation:
To obtain the percentage, express her score as a fraction of the total and multiply by 100%, that is
percentage score =
× 100% = 60%
100-70+30=60 hope this helps. Answer is 60. Oh wait, if that's an extra bracket, it could be 100-(70+30)=0