B. 1/4
Explanation:
1/2 = .5
.5 x .5 = 1/4
-3
144
-7
49/4 or 12.25
To complete the square for the expression (x^2 + 9x), take half of the coefficient of (x) (which is 9), square it, and add that value. Half of 9 is (4.5), and squaring it gives (20.25). Therefore, the number that must be added is (20.25). Thus, the completed square form is ((x + 4.5)^2).
369 must be added to get 518
9
Adding 100 completes the square. { I wonder why you want to complete the square when the expression already factors as x(x-20) }.
Decomposers must be added to any food chain or food web to form a complete food cycle.
9
26
1