Xavier has $140 in his lunch account. he spends $ for lunch each day. zack has $ in his lunch account. he spends $ each day. after how many days will the boys have the same amount of money in their accounts?

hiking down a winding trail.

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: