Question

Additional and SubtractionAnswers should have only three significant figures.Question a) 86.5-0.07 ?Question b) 30.61-87.3-42.109 ?

Answer 1

a. 86.5-0.07

The result of the subtraction is:

$\begin{gathered} 86.50 \\ -0.07 \\ ----- \\ 86.43 \end{gathered}$

As the answer should have only three significant figures then, the result is: 86.4

b. 30.61-87.3-42.109

The subtraction is:

$\begin{gathered} 30.61 \\ -87.30 \\ ----- \\ -56.690 \\ -42.109 \\ ------ \\ -98.799 \end{gathered}$

As the answer should have only 3 significant figures, then the result is -98.8