When samantha used a calculator to compute an answer, her screen read 6.09E-4. What does this mean?

Answer the questions in the attachment. a rescue helicopter is at point a and a rescue boat is at point e. the helicopter pilot spots boats in distress at points d and c, with angles as marked in the diagram. figure abce is a rectangle. the altitude of the rescue helicopter, represented by ae, is 5000 feet.

Add the fractions and simplify 1/2+ 1/3

Last one and the bottom answer choice is y=(x-4)^2+1 you guys!