Answer:
Picture is blurr. kindly upload clear pic
Hi there!
First we need to remember the following.

Now substitute both of the formulas.

Work out the parenthesis.

And finally collect terms.

~ Hope this helps you!
Answer:
Step-by-step explanation:
1. 5, 3.5,
,
, -7
2. 10, π ,3.1415, 0, -10
3. 1
, 1.44, 1.4(3), 1.(43), 
Answer: C
Step-by-step explanation:
Rejecting the null hypothesis means we've found a significant difference in the means. That means the probability that we'd see means so far apart by chance is less than our threshold of significance.