Earl is cutting a piece of cardboard in his art class. First he cut off 20% of the cardboard. Then he cut off 1 over 3 of the cardboard that was left. The piece of cardboard that Earl started with had an area of 900 square centimeters. What is the area, in square centimeters, of cardboard that was left after Earl made his cuts?

a

step-by-step explanation:

the radius is 2 times the diameter.

step-by-step explanation:

8

step-by-step explanation:

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: