For what value of x is the rational expression below when x is equal to 4? x+20/x+4

x+20/x+4

↓

4+20/4+4

↓

4+5+4=13

answer: i think it is (1,-2)

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: