Acube has side length aa. the side lengths are decreased to 20% of their original size. write an expression in simplest form for the volume of the new cube in terms of aa.

Volume of cube = 0.0008a³ unit³                        

Step-by-step explanation:

Let the side length of the cube be a units

Now, The side length of the cube is decreased by 20%

So, New side length of the cube = a - 20% of a

⇒ New side length of the cube = a - 0.20 × a  

⇒ New side length of the cube = a - 0.2·a

⇒ New side length of the cube = 0.8·a

Now, volume of the cube is given by the formula : Volume = (Edge)³

⇒ Volume of cube = (0.8a)³

⇒ Volume of cube = 0.0008a³ unit³                        

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: