Please answer correctly, thank you! Don't forget to explain your work:)

Ascuba diver was 80 feet below sea level and swam up at a rate of 4 feet per minute. the two solutions show how long it took the scuba diver to reach an elevation of 20 feet below sea level. lydia and max used the methods shown below to find the time it took the diver to reach the new elevation.

What signals you that factoring by grouping is the best method to use when factoring a problem?

Two lines parallel to the same plane are parallel to eachother