If a/4 = 9/a, then 1. A^2=36. 2. 4a=9a 3. a+4=9+a. 4 a-4=9-a

the answer to this question is in the pic

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:

this "question" looks more like a project is there any other info you can give me about this. it could be too complex for someone else to do on this website

all of them are elements inside set of real numbers since none of them appears to have complex number form.

hope this .

r3t40