Solve for x and y and show the procedure

The depth of a lake at a certain point, wich is a function of the distance of that point from shore, is 30 feet.

The following frequency table relates the weekly sales of bicycles at a given store over a 42-week period. value01234567frequency367108521(a) in how many weeks were at least 2 bikes sold? (b) in how many weeks were at least 5 bikes sold? (c) in how many weeks were an even number of bikes sold?

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