Eight avocados cost $4.

How much do 9 avocados cost?

$4.50

Step-by-step explanation:

if eight cost $4 that means each avocados cost 50 cents

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: