To calculate the rise in carbon dioxide levels between 2003 and 2008, we first find the difference between the two values:
- Carbon dioxide level in 2003: 223 billion metric tons
- Carbon dioxide level in 2008: 1350 billion metric tons
Now, we subtract the 2003 level from the 2008 level:
\[ 1350 - 223 = 1127 \text{ billion metric tons} \]
Next, we need to calculate the rise per year over the 5-year period (from 2003 to 2008):
\[ \text{Rise per year} = \frac{1127 \text{ billion metric tons}}{5 \text{ years}} = 225.4 \text{ billion metric tons per year} \]
Now, we want to express this in scientific notation.
225.4 billion metric tons can be written as:
\[ 2.254 \times 10^2 \text{ billion metric tons} \]
If we convert this to match the options given in the problem and express it in terms of the available choices:
- We can represent 225.4 billion metric tons as \(2.25 \times 10^2 \text{ billion metric tons}\).
Since the problem requests values in billions metric tons, we can deduce:
\[ \approx 2.25 \text{ billion metric tons (per year)} \]
Based on the multiple-choice answers:
For the first blank (the coefficient): The closest value is C: 2.25.
For the second blank (the exponent): To convert billion to the appropriate form, we recognize that \( 2.25 \times 10^2 \text{ billion metric tons} = 2.25 \times 10^{11} \text{ metric tons} \) (since \(1 , \text{billion} = 10^9\), we are adding that).
Thus the final part is:
- The units: The final answer must be in B: billion metric tons.
Therefore, the complete answer is:
Between 2003 and 2008, Mr. Jones found the rise to be approximately 2.25 (C) x 10 (B: 11) billion metric tons.
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