Answer: [tex]-64\frac{2}{7}\text{ feet}[/tex]
Step-by-step explanation:
When the scientists detect a signal frequency from the ocean floor, then the depth of submarine =[tex]-116\frac{2}{7}[/tex] feet
=[tex]-\frac{814}{7}[/tex] feet
When they dive farther to check the signal, then the depth of the submarine=[tex]-180\frac{4}{7}=-\frac{1264}{7}[/tex] feet.
The net change in their elevation =[tex]-\frac{1264}{7}-(-\frac{814}{7})[/tex]
[tex]=-\frac{1264}{7}+\frac{814}{7}\\=-\frac{450}{7}=-64\frac{2}{7}\text{ feet}[/tex]
