What is the number of significant figure in (3.20 + 4.80) `""xx10^(5)`?

Options

A. 5
B. 4
C. 3
D. 2

Answer

To determine the number of significant figures in the expression \( (3.20 + 4.80) \times 10^{5} \), we will follow these steps:

### Step 1: Perform the Addition
First, we need to add the two numbers:
\[ 3.20 + 4.80 = 8.00 \]

### Step 2: Express the Result in Scientific Notation
The result of the addition is:
\[ 8.00 \]
Now, we express this in scientific notation:
\[ 8.00 \times 10^{5} \]

### Step 3: Identify the Significant Figures
To count the significant figures:
- The number \( 8.00 \) has three significant figures. This is because:
- The digit '8' is significant.
- The two zeros following the decimal point are also significant because they indicate precision.

### Step 4: Conclusion
Thus, the total number of significant figures in \( 8.00 \times 10^{5} \) is 3.

### Final Answer
The number of significant figures in \( (3.20 + 4.80) \times 10^{5} \) is **3**.

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