Write down the formulas for the lines whose graphs are depicted below plz

What are correct trigonometric ratios that could be used to determine the length of ln

Two planes leave an airport at the same time, one flying east, the other flying west. the eastbound plane travels 20 mph slower. they are 1600 mi apart after 2 hr. find the speed of each plane.

If you are trying to move an attached term across the equal sign (=), what operation would you use to move it?