Question

Multiply (a) $\left(3\times {10}^{-5}\right)\left(3\times {10}^9\right)$ to get answer in decimal form

Divide (b)$\frac{7\times {10}^{-3}}{1\times {10}^{-7}}$to get answer in decimal form

Short answer

(a) Multiplied result is $90000$

(b) Divided result is$70000$

Step-by-step solution

part (a) Step 1 Given information  

$\left(3\times {10}^{-5}\right)\left(3\times {10}^9\right)$

part (a) Step 2 

$$\begin{gathered} \left(3\times {10}^{-5}\right)\left(3\times {10}^9\right)=3\times 3\times {10}^{-5+9} \\ =9\times {10}^4 \\ =90000 \end{gathered}$$

part (b) Step 1 Given information  

$\frac{7\times {10}^{-3}}{1\times {10}^{-7}}$

part (b) Step 2 

$$\begin{gathered} \frac{7\times {10}^{-3}}{1\times {10}^{-7}}=\frac{7}{1}\times {10}^{-3+7} \\ =7\times {10}^4 \\ =70000 \end{gathered}$$