An individual consumes two cups of coffee, each containing 90 mg of caffeine, two hours apart. The half-life of caffeine for this individual is 5.7 hours. a. Find the amount of caffeine in the bloodstream 1 hour after drinking the first cup of coffee.
b. Find the amount of caffeine in the bloodstream 1 hour after drinking the second cup of coffee.

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step-by-step explanation:

reduce the friction between its moving parts

step-by-step explanation:

in fact, by reducing the friction between the moving parts of the machine, it is possible to reduce the energy wasted due to this friction; therefore, more input energy is converted into useful work, and this will improve the efficiency of the machine.

1/3 + 1/3 ≠ 2/6 because 1/3 alone = 2/6  

step by step explanation:

1/3 + 1/3 = 2/3       2/3=4/6

it is 10.6 according to my calculations