Can someone please answer this question please answer it correctly and please show work please help me I need it

A

Step-by-step explanation:

Subtracting a negative number from a negative number is the same as just adding.

-9 - (-4 1/3) = -9 + 4 1/3

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: