Question

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

Answer 1

Explanation:

The question is given below as

$7.8\times10^7+9.9\times10^7$

Step 1:

Factorise the expression above, we will have

$\begin{gathered} 7.8\times10^7+9.9\times10^7 \\ (7.8+9.9)\times10^7 \\ 17.7\times10^7 \\ 1.77\times10^1\times10^7 \\ 1.77\times10^{1+7} \\ 1.77\times10^8 \end{gathered}$

Hence,

The final answer in scientific notation is

$1.77\times10^8$

The second part of the question is given below as

$\begin{gathered} 3.1\times10^6\times2.7\times10^{-2} \\ 3.1\times2.7\times10^6\times10^{-2} \\ 8.37\times10^{6+(-2)} \\ 8.37\times10^{6-2} \\ 8.37\times10^4 \end{gathered}$

Hence,

The final answer is scientific notation is

$8.37\times10^4$