Need help with sum math! this question just confuses me-
In which of the following expressions is the coefficient of term "x" 1?
A. 2x² + x-9
B. 2x ²- 3x + 1
C. 3x² - x - 5
D. x² + 2x + 7

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: