99.865 -: 1.29=

Question

A. calculator answer
B. correct significant digits

Answer 1

To calculate $99.865÷1.29$:

1. Perform the calculation using a calculator: $$99.865÷1.29\approx 77.5$$

2. Determine the correct significant figures:

   • The number $99.865$ has 5 significant figures.
   • The number $1.29$ has 3 significant figures.
   • The result should be reported with the minimum number of significant figures from the numbers used in the calculation, which is 3 in this case.

So the answer with the correct number of significant digits is: $$\approx 78.0$$

Thus, the final answer is: B. 78.0 (with correct significant digits).