Find (Supplementary angles) and the (Vertical angles). PLEASE

Ineed ! the person who answers and shows their work on they got the answer first will be marked the !

The brain volumes (cm cubed) of 50 brains vary from a low of 904 cm cubed to a high of 1488 cm cubed. use the range rule of thumb to estimate the standard deviation s and compare the result to the exact standard deviation of 175.5 cm cubed, assuming the estimate is accurate if it is within 15 cm cubed

Can you me find the missing length. i attached an image.