George sells baseball cards online. He estimates he can make $4.75 per card. If George has 83 cards, using front-end estimation, which choice would be closest to the amount George would make if he sells all his cards?

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:

what is the rest of the question? ?