Final answer:
The best approximation for π squared from the given options is 9.9, which corresponds to option d) 9.9, because the square of the approximate value of π (3.14159) is about 9.8696.
Step-by-step explanation:
To find the best approximation for π2, we first recall that the value of π (pi) is approximately 3.14159. When we square this approximation, we calculate Pi squared (π2) to be about 9.8696. Therefore, the closest approximation to π2 from the given options is 9.9.
Let's review significant figures in the given measurements:
- a. 0.0009 has one significant figure.
- b. 15,450.0 has six significant figures.
- c. 6x10³ has one significant figure (assuming 6 is an approximation).
- d. 87.990 has five significant figures.
- e. 30.42 has four significant figures.
The correct answer to the original question about the approximation for π2 is therefore option d) 9.9.