Two people start from the same point. one walks east at 8 mi/h and the other walks northeast at 4 mi/h. how fast is the distance between the people changing after 15 minutes? (round your answer to three decimal places.)

correct it is c.) b b

it is given that trillions of microbes make up to 1% to 3% of the body mass.

let's take average of this percentage: 2%

consider the average mass of the human body as 70 kg.

then, trillions of microbes would have mass  

therefore, 100 trillion micro-organisms would weigh:

this is an approximate value and could change depending on the mass of the human body and percentage of the microbes present in it.

average mass per microorganism =