HELP PLEASEEE represent the following sentence as an algebraic expression, where “a number” is the letter x. you do not need to simplify.
The product of 2 and the difference of a number and 9

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:

where is the picture

step-by-step explanation:

step-by-step explanation: