There are four boys and eight girls in a class. the teacher randomly selects one student to answer a question. later, the teacher randomly selects a different student to answer another question. the first student is a boy and the second student is a girl. what is the probability?

i got 86 for this

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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:

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