A boy-scout troop made a ramp for their derby car
race. The ramp stands 4
inches tall and the base of
the ramp is 13 inches.
How long is the ramp?

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:

yeah i know the problem you need. i am taking it right now. the answer is step 3

~mickey