Final answer:
The answer to the evaluation of 3 - 1 is 2. This question relates to basic arithmetic operations and significant figures, which are fundamental concepts in mathematics and are often taught in middle school.
Step-by-step explanation:
To evaluate 3 - 1, we simply subtract 1 from 3, which gives us 2. Therefore, the correct answer is a) 2.
Next, let's address some example exercises related to the concepts of this question:
- Identify the number and the unit in each quantity:
- 99 bottles of soda - Number: 99, Unit: bottles
- 60 miles per hour - Number: 60, Unit: miles per hour
- 32 fluid ounces - Number: 32, Unit: fluid ounces
- 98.6 degrees Fahrenheit - Number: 98.6, Unit: degrees Fahrenheit
- Determine the number of significant figures in the following measurements:
- 0.0009 has one significant figure.
- 15,450.0 has six significant figures.
- 6x10³ has one significant figure when written in scientific notation.
- 87.990 has five significant figures.
For numbers 99 and 100, both have two significant figures, and if the uncertainty is 1 for each:
- Percent uncertainty for 99 is approximately 1.01%.
- Percent uncertainty for 100 is exactly 1%.
Expressing the accuracy of these numbers in terms of significant figures or percent uncertainties depends on the context and the precision required for the measurement in question.