Simplify : 3ac + 5ab – 4ab + ac + 8bc

4ac + ab + acb Dont mind this, i just need to have this 20 or more characters long:

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: