Marcus works for a radio station. During his one hour radio show, he must play 12 commercials for a total of 10 minutes. Each
commercial is either 30 seconds or 60 seconds long.

The first one 6 second 10

just got it right :)

ummm seems that u didnt post the attachement !

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: