Two research submarines start to rise vertically toward the ocean surface. The Tri-I sub is at 4,863 feet below sea level (or –4,863 feet) and is ascending 81.1 feet per minute. The Quad-II sub is at 3,645 feet below sea level (or –3,645 feet) and is ascending 76.9 feet per minute. If the ocean surface is at 0 feet, how many minutes ( m
) must elapse for the two submarines to reach the same depth?

6.
Step 1: Choose the general equation for this situation.

rate of ascent of Quad-II sub
≤
rate of ascent of Tri-I sub

rate of ascent of Tri-I sub = rate of ascent of Quad-II sub

depth of Quad-II sub
≤
depth of Tri-I sub

depth of Quad-II sub = depth of Tri-I sub

number of minutes elapsed for Tri-I sub = number of minutes elapsed for Quad-II sub

7.
Step 3: Select the correct equation for the given situation. Then, select the solution for that equation.

m
=
290
minutes

m
=
145
minutes

-
4
,
863
+
81.1
m
=
-
3
,
645
+
76.9
m

-
4
,
863
+
76.9
m
=
-
3
,
645
+
81.1
m

m
≤
53.8
minutes

-
4
,
863
-
81.1
m
≥
-
3
,
645
+
76.9
m

m
=
53.8
minutes

4
,
863
-
76.9
m
=
3
,
645
-
81.1
m

8.
Step 2: What does the variable represent in this problem?

The variable
m
represents the depth in feet.

The variable
m
represents the distance between the two subs in feet.

The variable
m
represents the number of minutes elapsed.

The variable
m
represents the rate of ascent in feet per minute.

the answer is d i aint explaining ; )

it's hard to read but b: starting on a project last minute can increase anxiety.

that sounds the best out of the answers given because procrasinating can increase stress and anxiety because working on something last minute is stressful.

hope this , have a nice rest of your day

the columbian exchange, also known as the columbian interchange, named for christopher columbus, was the widespread transfer of plants, animals, culture, human populations, technology, and ideas between the americas, west africa, and the old world in the 15th and 16th centuries, related to european colonization and trade following christopher columbus's 1492 voyage. invasive species, including communicable diseases, were a byproduct of the exchange. the changes in agriculture significantly altered and changed global populations. the most significant immediate impact of the columbian exchange was the cultural exchanges and the transfer of people between continents.

the new contact between the global population circulated a wide variety of crops and livestock, which supported increases in population in both hemispheres, although diseases initially caused precipitous declines in the numbers of indigenous peoples of the americas. traders returned to europe with maize, potatoes, and tomatoes, which became very important crops in europe by the 18th century.

the term was first used in 1972 by american historian alfred w. crosby in his environmental history book the columbian exchange. it was rapidly adopted by other historians and journalists and has become widely known.