Question

(7.8x10^7) + (9.9x10^7) write in scientific notation And (3.1x10^6)x(2.7x10^-2)

Answer 1

Step-by-step explanation:

The question is given below as

`7.8*10^7+9.9*10^7`

Step 1:

Factorise the expression above, we will have

`\begin{gathered} 7.8*10^7+9.9*10^7 \\ (7.8+9.9)*10^7 \\ 17.7*10^7 \\ 1.77*10^1*10^7 \\ 1.77*10^(1+7) \\ 1.77*10^8 \end{gathered}`

Hence,

The final answer in scientific notation is

`1.77*10^8`

The second part of the question is given below as

`\begin{gathered} 3.1*10^6*2.7*10^(-2) \\ 3.1*2.7*10^6*10^(-2) \\ 8.37*10^(6+(-2)) \\ 8.37*10^(6-2) \\ 8.37*10^4 \end{gathered}`

Hence,

The final answer is scientific notation is

`8.37*10^4`