My house is two blocks west and 5 blocks north of my school. my friends house is 8 blocks east and one block south of the school.
how many blocks would i drive from my house to my friends house?
the school is at the origin of town.

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: