(0.003999 X 10^8) + (6.00111 X 10^8)

6.005109 x 10⁸

Explanation:

Given expression:

      (0.003999 x 10⁸) + (6.00111 x 10⁸)

Now, to solve for this sum,

   take the coefficient and sum:

     =  (0.003999 + 6.00111) x 10⁸

     = 6.005109 x 10⁸

In this kind of problem, just make sure the exponent parts are the same then add the coefficient together.

b. acid is the correct answer @jayxboof all social media

acid : acids are those which accepts an electron-pairs.

base : bases are those which donates ab electron-pairs.

alkali : it is a base that dissolves in water. it is basically a base and the ph greater than 7.

hydroxide ion : it is a poly-atomic ion which is negatively charged.