Answer:
The element you add is 
Step-by-step explanation:
The element you add is 
Remember that

So, in order to complete the square you add 
But when you multiply times
you get

Answer:
It should be A
Step-by-step explanation:
multiply the - by 7/8 to get -7/8
Answer:
Move the top left and right to the sides of the second to last row, then move the single circle from the bottom row to the top.
Step-by-step explanation:
10 chickens lay 2 eggs each. But 2 chickens lay 3 eggs each
Answer:
Step-by-step explanation:
(fx+cd)/(x-f)=1/2
Cross multiplication,
2*(fx + cd) = 1 * (x-f)
2fx + 2cd = x - f
2fx - x = -2cd - f
x (2f - 1) = -2cd -f
x = (-2cd-f )/ (2f-1)