How much of the original air is present after 240 breaths ?

29%

Step-by-step explanation:

the original air is present after 240 breaths 0000000060 2 ML of the original air is present so after like  240 breaths  you can have 400 mg of ibuprofen. Each hour, the amount of ibuprofen in the person's system decreases by about 29%.  

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explanation:

infrared radiation has wavelength in the range between 700 nm and 1 mm. lets' convert these values into scientific notation, keeping in mind that:

let's start from the lower value, we have:

(we moved the dot two places to the left, so we increased the exponent by 2 units, from -9 to -7)

the higher value is:

so, the range of wavelength of infrared radiation is: