Answer: D
Just add 10 zeros behind the 6.
You get 60,000,000,000
Checking this with a calculator verifies this is the correct answer.
2.5 plus 13.5 times 10
Hope that helps
I don't know the real answer, but I think it is C. (I am sorry if I am wrong).
The vertex-form of a quadratic equation is

, where (h, k) is the vertex of the parabola.
To complete the square of a quadratic expression in standard form, we write the coefficient of x as 2*b, then add and subtract

.


so b=4, now add and subtract

.

