Answer:
use a tree diagram to get a visual representation over it then calculate you're probability.
If Ann can build the model in 3 hours, then in 1 hour she gets 1/3 of it done. Likewise, if Sam can build the model in 6 hours, then in 1 hour he gets 1/6 of it done. We are looking to find how long it takes when they combine their efforts, so we will add the two together and set it equal to 1/x, x being the number of hours it takes for both of them to get the whole job done. The equation then looks like this:
. You will have to find the common denominator to add those fractions, and once you do, cross multiply to solve for x.
Answer:
39 liters
Step-by-step explanation:
6.5×6=39
so 39 litres
Answer:
7 feet below sea level
Step-by-step explanation:
he was at 3 then you subtract 10 feet because he dives.