HELP! The radioactive isotope sodium-24 is used as a tracer to measure the rate of...

Ryan

New member
...flow in an artery of vein..? The half-life of sodium-24 is 14.9 hours. Suppose that a hospital buys a 50-gm sample of sodium-24.

a) How much of the sample will remain after 46 hours?

b) How long will it be until only 1 gm remains?

2) Prove the following identity

sec x / sin x - csc x / sec x = tan x
 
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