My buddy and i have just finished a dive to 15 m/50 ft for 60 minutes. we want to return to the same site and depth and stay another 60 minutes. we can to see about how long we have to remain at the surface to have enough no stop timea. wait and check our no stop times on our computers periodicallyb. use the dive computer plan mode, if our computers have themc. use a dive planning appd. check the rdp table or erdpml

answer:

all of them a b c d

step-by-step explanation:

a. wait and check our no stop times on our computers periodically

b. use the dive computer plan mode, if our computers have them

c. use a dive planning app

d. check the rdp table or erdpml

b i think

step-by-step explanation:

not really sure

step-by-step explanation:

12: 00 p.m. to 7: 00 p.m. is a total of 7 hours.

4: 00 p.m. to 7: 00 p.m. is a total of 3 hours.

this means that from 4: 00 p.m to 7: 00 p.m. this represents 3/7 of what was lost from 12: 00 p.m. to 7: 00 p.m.

after knowing this, after doing 11,600 - 6,800 = 4,800

4,800 represents 3/7 of what was lost for 7 hours.

we then divide 4,800 by 3 which gets 1,600.

because we know that 1,600 represents 1/7 of how much water was lost, we just have to multiply by 7, which gets 11,200.   after adding 11,200 to how much water was left at 7: 00 p.m. which was 6,800. 11,200 + 6,800 = 18,000

this means that the pool originally had 18,000 gallons in the pool.

you can also check your work by doing 18,000 - 4(1600), which becomes           1800 - 6400 which gets you 11,600.