Answer :
Sure! Let's go through the problem step by step.
### Problem:
We need to subtract 0.8 grams from 38.95 grams and then round the answer to the correct number of significant figures.
### Steps:
Step 1: Perform the subtraction.
[tex]\[ 38.95 \, \text{g} - 0.8 \, \text{g} = 38.15 \, \text{g} \][/tex]
Step 2: Determine the correct number of significant figures.
- The number 38.95 has 4 significant figures.
- The number 0.8 has 1 significant figure.
According to the rules for significant figures in subtraction, the result should be rounded to match the least number of decimal places found in the original numbers. Here, 0.8 has one decimal place.
Step 3: Round 38.15 to the correct number of decimal places.
Since we need one decimal place, we round 38.15 to 38.2.
### Final Answer:
[tex]\[ 38.2 \, \text{g} \][/tex]
So, the correct answer is 38.2 g.
### Problem:
We need to subtract 0.8 grams from 38.95 grams and then round the answer to the correct number of significant figures.
### Steps:
Step 1: Perform the subtraction.
[tex]\[ 38.95 \, \text{g} - 0.8 \, \text{g} = 38.15 \, \text{g} \][/tex]
Step 2: Determine the correct number of significant figures.
- The number 38.95 has 4 significant figures.
- The number 0.8 has 1 significant figure.
According to the rules for significant figures in subtraction, the result should be rounded to match the least number of decimal places found in the original numbers. Here, 0.8 has one decimal place.
Step 3: Round 38.15 to the correct number of decimal places.
Since we need one decimal place, we round 38.15 to 38.2.
### Final Answer:
[tex]\[ 38.2 \, \text{g} \][/tex]
So, the correct answer is 38.2 g.