2. Use the following arithmetic sequence and the formula an = 22 + (n-1)d to answer the questions below.
I
123, 116, 109, 102,95, ...
Part I: Find the value of each of the following:
a =
and da
Part II: Find the explicit formula. Show your work.

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:

i believe it is the square root of 122 because when you turn it on it's side, to where the 5 inches is on the bottom, it looks like it is the same length.

8 < i think

hope this !