Please help it would be greatly appreciated. The height of an isosceles trapezoid is 12 cm long while the legs are 15 cm. Find the length of the shorter base if the longer base is 31 cm long.

Dean and karlene get paid to write songs. dean is paid a one-time fee of $20 plus $80 per day. karlene is paid a one-time fee of $25 plus $100 per day. write an expression to represent how much a producer will pay to hire both to work the same number of days on a song.