You are in a canoe going downstream (with the current). If the current is traveling 5mi/hr, and you are rowing 12 mi/hr, what is the velocity of the canoe

The velocity of the canoe is 7 mi/hr.

Explanation:

Given that,

Speed of current,

Speed of the person,

We need to find the velocity of the canoe. Here, the person is going downstream with the current. So, the velocity of canoe is given by :

So, the velocity of the canoe is 7 mi/hr. Hence, this is the required solution.  

they deliver oxygen to the blood

explanation:

for  example, forests have higher evapotranspiration than other ecosystems,  such  as grasslands, because of their deeper roots and greater leaf area. thus forests have a net moistening effect on the atmosphere and become a moisture source for downwind ecosystems.