Answers:
First box = 864
Second box = 3136
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Explanation:
The weird looking E symbol is the greek uppercase letter sigma which stands for "sum". You'll be adding everything in the x^2 column to find that 64+144+256+400 = 864, which is already done for you in the table (as the 864 is at the bottom of the second column, in the "total" row).
In short, you just copy the 864 into the first box.
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For the second box, you'll square the 56 to get 3136
This is because the table shows that adding up all the x values leads to 56
(8+12+16+20 = 56)
So that means
and 
The end result will not be the same as the beginning number because of the change in amounts in-between. Here's an example similar but easier
I have two dollars
I get half of it more
I now have three dollars
I give half of that away
Now I have a dollar and a half
It all depends on that the course if of the numbers
Y=-x+5
Y=2x-4
X would be your slope
Y intercepts would be (0, 5) , ( 0,-4)
Formula i used was Y=Mx+B
Answer:
2.5 × 10^-5
<em>please correct me if im wrong</em><em>.</em>