Work out $$ \left(4.2 imes 10^{11} ight)-\left(7 imes 10^{9} ight) $$

Question

Work out $$ \left(4.2 	imes 10^{11}ight)-\left(7 	imes 10^{9}ight) $$

UpStudy AI · Accepted Answer

To compute $$ \left(4.2 \times 10^{11}\right) - \left(7 \times 10^{9}\right) $$, follow these steps:

1. **Express both numbers with the same exponent:**
   
   $$ 4.2 \times 10^{11} $$ can be rewritten as $$ 420 \times 10^{9} $$ because $$ 10^{11} = 100 \times 10^{9} $$.

2. **Subtract the two values:**
   
   $$
   420 \times 10^{9} - 7 \times 10^{9} = (420 - 7) \times 10^{9} = 413 \times 10^{9}
   $$

3. **Express the result in standard scientific notation:**
   
   $$ 413 \times 10^{9} $$ can be rewritten as $$ 4.13 \times 10^{11} $$.

**Final Answer:**
$$
4.13 \times 10^{11}
$$
$$ 4.13 \times 10^{11} $$

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