To calculate the total storage of the mobile phone after buying additional bolts, you'll first convert the given storage amounts to the same unit and then sum them up.
The mobile phone holds 1.28 billion bolts of storage initially. If you buy an additional 384 billion bolts, you would add them together:
\[ 1.28 \text{ billion bolts} + 384 \text{ billion bolts} = 385.28 \text{ billion bolts} \]
Now, regarding significant figures:
- The number 1.28 has three significant figures.
- The number 384 has three significant figures as well.
When adding these two figures, the result should be rounded to the least number of decimal places of the numbers being added, which in this case is zero decimal places (since 384 is a whole number).
Thus, when considering significant figures, we round 385.28 to 385.
Therefore, if you buy the additional bolts, you would have 385 billion bolts of storage in total.
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