Abbie decides to start doing crunches as part of her daily workout. she decides to do 15 crunches the first day and then increase the number 4 each day after that. write an explicit formula for the number of crunches abbie will do on day n.

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: